A room is10m long 6m wide and 4.2m high .it has one door of 2.5mby1.5 mand one window of dimension 1.5 by 1m find the cost of whitewashing the wall at₹2.50 per sq.m
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Answer: Rs. 322.87
Surface area of four walls = 2 (10m + 6m )×4.2m
= 134.4m²
Door= 2.5m*1.5m= 3.75²
Window= 1.5m*1m= 1.5m²
Door+Window= 5.25m²
= 134.4m² - 5.25m²
= 129.15m²
129.15m²*Rs2.50
= Rs.322.87
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