Question

A door 2m*1m is fixed on a wall.The wall is 8.5 long and 2m high.Find the cost of whitewashing the wall ₹40 per square meter​

Answer 1

Answer: The cost is $600

Explanation: The wall is a rectangle whose area is calculated as:

S = 8.5 x 2

S = 17

However, there is a door on the wall which won't be whitewashed so:

Area of door:

`S_(d)` = 2 x 1

`S_(d)` = 2

Whitewashed area will be

S -
`S_(d)` = 17 - 2

S -
`S_(d)` = 15m²

To whitewash the wall, it costs $40 per each m², so:

Cost = 15*40

Cost = 600

To whitewash the wall, it will cost $600.