Question

A hall of 10m, breadth 12m ,and height 5m is to be fixed with wall paper on all the four walls. If the cost of fixing the wall paper is Rs 35 per square metre, how much will it cost?

Answer 1

$lsa \: of \: cuboid = 2h(l + b) \\ = 2 \times 5(10 + 12) \\ = 10 \times 22 \\ = 220 \\ therefore \: cost \: of \: fixing \: wall \: paper \\ = 220 \times 35 \\ = 770rupees$

Answer 2

2×h(l+b)

2×5+(12+10)

10×22

220

220×35

770