Basir's working hours per day were increased by 15% and his wages per hour were increased by 20%. By how much percent did his earnings increase?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 38
increment in working hour = 15%
increment in wages = 20%
Let the working hours before the increment be 10 hours and daily wages per hour be Rs10
Daily wages of basir = 10 × 10 = 100
working hours after increment = 10 × (115/100) = 11.5
Daily wages per hour before increment = 10 × (120/100) = 12
Daily wages of Basir after increment = 11.5 × 12 = 138
increment in his daily earning = 138 - 100 = 38
% increment in his daily earning = (38/100) × 100 = 38%