A monthly salary of Mr. Koko was #320 for each of the first 3 years of his service period. He got annual services increement of #40 per month each of the following successive 12 years and his salary remains constant till retirement. During the calculation of his retirement benefits, it was observed that Mr. Koko average monthly salary during his service year was #698. Determine the number of years he spent in his service.?
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Asked by Dharmmie on 1st December, 2020
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