Rohan spends 40% of his salary on food, 20% on house rent, 10% on entertainment and 10% on conveyance. If his savings at the end of a month are Rs. 1500. then his monthly salary is Choose one.
A) Rs. 6000
B) Rs. 7500
C) Rs. 8000
D) Rs. 10,000
E) None
Sol.   Saving = [100 - (40 + 20 + 10 + 10]% = 20%.   Let the monthly salary be Rs. x.   Then, 20% of x = 1500   ⇔ 20 / 100x = 1500   ⇔ x = 1500 × 5 = 7500.   Answer Rs. 7500
<result>B</result>
Rohan spends 40% of his salary on food, 20% on house rent, 10% on entertainment and 10% on conveyance. If his savings at the end of a month are Rs. 1500. then his monthly salary is