Question

12. The perimeter of a room is 28 m and its height is 2.5 m. Find the cost of whitewashing
its walls at the rate of 5 per square metre.​

Answer 1

Answer-

Step-by-step explanation:

Hight× base=?

Perimeter=2.5×base

we did not know base so

28=2.5×b

28÷2.5=b

11.2=base

know we now the base

know find the area

Area= hight×base

Area=28×2.5

70

the cost of whitewashing =5/meter

28×2.5

70

Answer 2

Answer:

the cost of whitewashing=5/meter

28×2.5

= 70

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