Question

Mrs Rane gives 0.025 part of her salary as pocket money to her son Vinod every month. Vinod spends 0.8 part of his pocket money and saves the rest. If he saves 277.50 in three months, how much does Mrs Rane earn in a month?
With Explanation!

Answer 1

Let me Rane monthly salary=x
She gives 0.025 part of her salary as pocket money to her son vinod every month= (25/1000)x
=(1/40)x
vinod spends 0.8 part of his pocket money
= (8/10)(1/40) x = 1/50)x
vinod saves the rest of pocket money=
(1/40)x - (1/50) = (10/2000)x =
(1/200)x
Given that vinod saves 3 months pocket money = 277.50
vinod saves one month pocket money =
277.50/3=92.50
according to the problem (1/200)x =
92.50 = x= 92.50 × 200 = 18500 rs
so,Mrs rane earns in a month = 18500 rs