13. A hall is 12 m long, 10 m wide and 5 m high. Its wall and the roof are to be whitewashed from inside Find the total area to be whitewashed. Also, find its cost at the rate of ₹5.40 per sq.m.
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Answer:
ANS = ₹1836
Step-by-step explanation:
length = 12m
breadth = 10m
height = 5m
area of the wall and roof = 2(lb + bh + lh) -lb
=2(12×10 + 10×5 + 12×5) - 12×10
=340m^2
cost of whitewashing 1m^2 = ₹5.40
cosr of whitewashing 340m^2 = 5.40 × 340
= ₹1836
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