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 Rs.277.50 in every three months then how much does Mrs.Rane earn in a month ???

Answer 1

Let x be the monthly salary of Mrs. Rane.

Vinod's pocket money = $0.025$ of x

Let Vinod's pocket money be y. We know, y = 0.025x.

Expenditure =    $0.8$  of  y
So, savings =     $(1-0.8)$   of   $y$ =    $0.2y$

Given, savings = Rs. 277. 50

$0.2y=277.50$

We have to solve for x. So, we put x.

[∵ y = 0.025x]
   
$0.2*0.025x=277.50$

⇒   $0.005x=277.5$

⇒   $x= \frac{277.5}{0.005}$

⇒   $x=55500$       (ans.)