(a) Subject to the limitations of subsection (b), any type of contract that will promote the best interests of the state may be used under this article.
(b)(1) The use of a cost-plus-a-percentage-of-cost contract is prohibited.
(2) A cost-reimbursement contract may be used only when a determination is made in writing that either of the following apply:
a. The cost-reimbursement contract is likely to be less costly to the state than any other type of contract.
b. It is impracticable to obtain the supplies or services required except under a cost-reimbursement contract.