Q109 of 113 Page 110

A carpenter charged Rs. 2500 for making a bed. The cost of materials used is Rs. 1100 and the labour charges are Rs. 200/hr. For how many hours did the carpenter work?

Let the carpenter worked for x hr.

Given, labour charge = Rs. 200 per hr


Then, total labour charge = Rs. 200x


As, amount charged by carpenter for making a bed = cost of materials + total labour charge


∴2500 = 1100 + 200x


200x = 2500-1100


200x = 1400



Hence, the carpenter worked for 7hrs


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