Question

find the surface area of a closed box of wood whose dimensions are 2m, 1.5m and 80cm. Find the cost of wood used to make it at the rate of 120.55per metre square​

Answer 1

Total surface area =2(lb+bh+hl)=2{(2×1.5)+(1.5×0.8)+(0.8×2)}=11.6m 2

Volume =lbh=0.8×2×1.5=2.4m 3

cost=120.55×volume=120.55×2.4=289.32