1.

A man’s working hours per day were increased by 20% and his wages per hour were increased by 15%. By how much percent were his daily earnings increased?1). 38%2). 35%3). 5%4). 40%

Answer»

LET the NUMBER of working hours be x

Let the wages PER hours be y

Initial daily earnings = Number of working hours × Wages per hour = xy

New number of working hours = x + (20/100) × x = 1.2x

New wages per hour = y + (15/100) × y = 1.15y

New daily earnings = Number of working hours × Wages per hour = (1.2x) × (1.15y) = 1.38xy

%Change in daily earnings = (Change in daily earnings)/(Initial daily earnings) × 100

%Increase in daily earnings = (1.38xy -xy)/xy × 100 = 38%


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