JAMB Mathematics 2018 Paper

Concept:Salary increases by a fixed amount after every completed six-month period, so count the number of increases before the given month.Explanation:The eighth month of the third year is the $32$nd month of employment.An increase occurs after every $6$ months: after months $6, 12, 18, 24$, and $30$.So, by the $32$nd month, the worker has received $5$ increases.Total increment $= 5 \times 36 = 180$.Salary $= 540 + 180 = 720$.Answer:C. $\mathrm{N}720.00$