Question

Out of his income,Mr Rajesh spends 20% on house rent and 70% of the rest on household expenditure.If he saves 3600 rupees per month,then what is his total income per month?​

Answer 1

let total income of Mr Rajesh is = x

spent on house rent = 20% = 20x/100

house hold expenditure = 70% = 70x/100

saving = 3600

$x \: = \frac{20x}{100} + \frac{70x}{100} + 3600 \\ x \: = \frac{2x}{10} + \frac{7x}{10} + 3600 \\ x \: = \frac{2x + 7x + 36000}{10} \\ 10x = 9x + 36000 \\ 10x - 9x = 36000 \\ x = 36000$

total income of Mr Rajesh is Rs. 36000/month