(1) The equalization board may increase assessments made, and may add assessments omitted by the city assessing officer, but it may decrease individual assessments or strike erroneous assessments from the assessment roll only on appeals from interested parties. It may increase or decrease the assessment of all property or of any class of property by a uniform percentage, in which case the requirement of notice and hearing shall not apply, but a notice of such blanket increase or decrease shall be inserted once in the official city newspaper.
(2) The members of the board may receive such compensation on a per diem basis for each day of duty as provided by ordinance.