Question

A door of length 3m and breadth 1m is fitted in a wall. the length of the wall is 4.5m and the breadth is 3.6 m. find the cost of white washing the wall at the rate of rs. 16 per m

Answer 1

cost = 16× ( 4.5×3.6 - 3×1)
= 16 × (16.20 - 3)
= 16 × 13.20
= 211.20 Rs/-

Answer 2

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Here is your answer.

Area of a Wall = (4.5 × 3.6)
= 16.2 sq.m

Area of Door is = 3 × 1
= 3 sq.m

Area of Wall for white wash = 16.2 - 3
= 13.2 sq.m

Cost of white wash is Rs 16 × 13.2
= Rs 211.20

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