Radha spends 40% of her salary on food, 20% on house rent,

Radha spends 40% of her salary on food, 20% on house rent, 10% on entertainment and 10% on conveyance. If her savings at the end of a month are ₹ 1500, then her salary per month (in ₹) is

Radha’s total percentage expenditure = (40 + 20 + 10 + 10)% = 80%
Percentage savings = 100 – 80 = 20%
Now, 20% of her total salary = 1500

Her total salary =	1500 × 100	= ₹ 7500
	20

Second method to solve this question ,
Here, p = 40% , q = 20% , r = 10% , s = 10% and R = ₹ 1500

Monthly income =	100	× R
	100 - (p + q + r + s)

Monthly income =	100	× 1500
	100 - (40 + 20 + 10 + 10)

Monthly income =	150000
	100 - 80

Monthly income =	150000	= ₹ 7500
	20