A cuboidal house has dimensions 9m×7m×5m.find the cost of white washing the walls at the rate of ₹20 per m square, if it has two doors of dimensions 1m by 70cm each and four windows of dimensions 26cm by 25cm each.
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Answer:
Step-by-step explanation:
LSA of cuboidal room = 2h(l+b)
= 2*5(9+7)
= 10 * 16
= 160m^2
area of door = l*b
= 1 * 0.7 = 0.7m^2
2 door = 0.7*2 = 1.4m^2
area of window = l * b
=0.26 * 0.25 = 0.065m^2
4 windows = 0.065 * 4 = 0.26
Area to be white washed = 160 - 1.4 + 0.26
= 160- 1.66
= 158.34m^2
Cost of white washing = 158.34 * 20
= Rs.316.68 Ans.
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