A room is 8.5m long, 6.5 m broad and 3.4 m high. It has two doors, each measuring (1.5 m by 1m) and two windows , each measuring (2m by 1m). Find the cost of painting its four walls at ₹ 160 per m².
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area of four wall =2×h(l+b)
=2×3.4(8.5+6.5)
=6.8×15
=102m^2
now area of two doors = 2(1.5×1)= 3m^2
now area of two windows=2(2×1)=4m^2
total are of two windows and doors = 7m^2
area to be paint = (102-7)=95m^2
cost of painting=(95×160)=15200 rupees.
=2×3.4(8.5+6.5)
=6.8×15
=102m^2
now area of two doors = 2(1.5×1)= 3m^2
now area of two windows=2(2×1)=4m^2
total are of two windows and doors = 7m^2
area to be paint = (102-7)=95m^2
cost of painting=(95×160)=15200 rupees.
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