In a regular week, there are 5 working days, and the working hours are 8 per day. A man gets Rs. 2.40 per hour for regular work and Rs. 3.20 per hour for overtime. If he earns Rs. 432 in 4 weeks, then how many hours does he work?

Explanation

In 4 weeks there are 4 × 5 = 20 regular working days. Regular working hours are 20 × 8 = 160, giving regular wages of 160 × Rs. 2.40 = Rs. 384. The overtime earning is Rs. 432 − Rs. 384 = Rs. 48. At Rs. 3.20 per hour, overtime is 48 ÷ 3.20 = 15 hours. Total working time is 160 + 15 = 175 hours.