¶1Janice Cornell sued Texaco, Inc. and Joe Hood’s Service, Inc. for damages sustained as the result of a motor vehicle collision. The jury returned a verdict in favor of defendant Joe Hood’s and in favor of plaintiff against defendant Texaco. The jury assessed damages of $10,000 and found Texaco to be 10% at fault and plaintiff to be 90% at fault. Judgment was entered accordingly; the Court of Appeals, Eastern District, affirmed. This Court granted transfer to consider whether in a negligence action against multiple defendants on multiple theories of liability differing as to each defendant, the jury may be instructed on plaintiff’s comparative fault after each of plaintiff’s verdict directing instructions. This Court determines that a trial court errs in such repetitive instruction and determines further that plaintiff was not prejudiced by such error in this case. Judgment for plaintiff affirmed.
¶2Appellant contends the trial court erred in giving defendants’ two identical comparative negligence instructions because the instructions in combination were repetitive and therefore overemphasized the plaintiff’s comparative fault. Respondents assert each defendant was entitled to its own comparative negligence instruction because plaintiff submitted a separate verdict directing instruction against each defendant.
¶3The plaintiff was driving west on St. Charles Rock Road in St. Louis County when defendant Texaco backed its tanker truck onto St. Charles Rock Road and stopped the vehicle in the lane reserved for moving traffic. At the same time, defendant Joe Hood’s stopped its tow truck in the lane reserved for moving traffic and shined its lights into oncoming traffic. The tow truck’s overhead flashing lights were inoperable and before the driver of the tow truck could warn the driver of the tanker that the emergency lights were not working, plaintiff drove around the tow truck and struck the tanker causing injury to plaintiff.
¶4Plaintiff sued Texaco on the theory that Texaco failed to yield the right-of-way or *682that Texaco blocked a lane of traffic [Instruction No. 6]. She sued Joe Hood’s on the theory that Joe Hood’s improperly used its vehicle high beam headlights which blinded plaintiff [Instruction No. 8]. Each defendant submitted and the trial court gave an identical non-MAI affirmative defense comparative fault instruction:
INSTRUCTION NO. 7 [and No. 9]
You must assess a percentage of fault to plaintiff Janice Cornell if you believe:
First, plaintiff Janice Cornell failed to keep a careful lookout, and Second, plaintiff Janice Cornell was thereby negligent, and Third, such negligence of plaintiff Janice Cornell directly caused or directly contributed to cause any damage plaintiff Janice Cornell may have sustained.
¶5The affirmative fault instruction given is a modified MAI instruction and therefore must be simple, brief, impartial and free from argument. Rule 70.02(e). Appellant has no quarrel with the content and form of the instructions individually but contends that the dual submission violated Rule 70.02.
¶6In Gustafson v. Benda, 661 S.W.2d 11 (Mo.1983), this Court adopted the pure comparative fault doctrine substantially as articulated in the Uniform Comparative Fault Act. Gustafson, 661 S.W.2d at 15. Section 1 of the Uniform Comparative Fault Act states that “any contributory fault chargeable to the claimant diminishes proportionately the amount awarded as compensatory damages for an injury attributable to the claimant’s contributory fault....” The jury instruction requiring assessment of plaintiff’s fault should be simple and instruct the jury to diminish the damages awarded in proportion to the amount of negligence attributable to the plaintiff. See Missouri Pacific Railroad Co. v. Whitehead & Kales Co., 566 S.W.2d 466 (Mo. banc 1978).
¶7If multiple defendants are involved, states following the pure comparative fault doctrine apply the “degrees of negligence” rule to reduce the plaintiff's award in the proportion that the plaintiff’s share of negligence bears to the total negligence of all the parties, see 1 Comparative Negligence: Law and Practice § 3.10 (1986); states following modified comparative fault sometimes compare the negligence of the plaintiff with that of each defendant and if the negligence of one defendant is less than that of the plaintiff, the plaintiff cannot recover from that defendant. See, e.g., Odenwalt v. Zaring, 102 Idaho 1, 624 P.2d 383 (1980); Cambern v. Sioux Tools, Inc., 323 N.W.2d 795 (Minn.1982). Under a pure comparative fault system, the plaintiff’s negligence is not compared with that of defendant A and then again with defendant B, but rather it is compared with the cumulative negligence of all the defendants. Accordingly, only one affirmative defense comparative fault instruction should be given and the court erred in this case when it gave two.
¶8This Court must determine whether the erroneous instructions prejudiced the plaintiff. Rule 70.02(c). There is no presumption of prejudice because there is no MAI mandate against the use of multiple affirmative defense comparative fault instructions. See Murphy v. Land, 420 S.W.2d 505, 507 (Mo.1967). To reverse a jury verdict on the ground of instructional error, the party challenging the instruction has the burden to show the offending instruction misdirected, misled or confused the jury. Essex v. Getty Oil Co., 661 S.W.2d 544, 558 (Mo.App.1983).
¶9Plaintiff made no objection to the dual instructions at trial and although contemporaneous objections to instructions are not required to preserve claims of error (Rule 70.03), failure to raise the issue may be considered in determining whether an erroneous instruction is prejudicial. Hudson v. Carr, 668 S.W.2d 68, 71-72 (Mo. banc 1984). If a defect is not readily apparent to counsel preparing to argue the case, it is unlikely the jury will be confused or misled. Id. at 72. The jury in this case found one defendant, Joe Hood’s, free from fault which would preclude the jury from having to consider the affirmative defense instruction coming after the verdict directing instruction for that defendant. Koch v. *683Bangert Brothers Road Builders, Inc., 697 S.W.2d 315, 317 (Mo.App.1985). The jury’s exoneration of one defendant and its finding of liability on the part of the other tends to show a discriminating jury which was not misled or confused.
¶10Plaintiff cites Nugent v. Hamilton & Sons, Inc., 417 S.W.2d 939 (Mo.1967) and Beers v. Western Auto Supply Co., 646 S.W.2d 812 (Mo.App.1982). In Nugentthree converse instructions instead of one were given and the Court found prejudicial error because the instructions overemphasized the defense. Nugent, 417 S.W.2d at 941. In Beersfour contributory fault instructions instead of one were given and the court found error because “[t]he defendant’s purpose in submitting these four contributory fault instructions was undoubtedly to hammer home the instruction to the jury.” Beers, 646 S.W.2d at 814. Nugentand Beersare distinguishable from the instant case in that the repetitive instructions in those two cases were direct violations of MAI. In addition, the instruction in this case was stated identically only twice which, when considered with the jury’s finding of liability on the part of one defendant and not the other, refutes plaintiff’s contention that the jury was misled or confused. Koch, 697 S.W.2d at 317.
¶11Although the court erred in its dual instructions, there was no prejudice to plaintiff as a result of the erroneous instructions, and the judgment of the trial court is affirmed.