Ashok’s monthly salary varies directly with the number of working days in that month. His salary would be Rs. 9000 if there are 20 working days in a month. Find his monthly salary if there are 21 working days in that month.
Explanation:
If a month has D working days and Ashok’s salary in that month is Rs. S, S ∝ D
(S1)/(S2) = (D1)/(D2)
If S1 = 9000, D1 = 20 and D2 = 21.
S2 = S1D2D1 = 9000×2120 = Rs. 9,450
Hence, option (b).
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