# <span lang="EN-GB

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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