A laboratory is 9 m long, 8 m broad and 6 m high. It has 2 doors each of size 3 m and 1.5 m and four windows each of size 1.5 m and 1 m. Find the cost of whitewashing the walls of the laboratory at the rate of ₹1.75 per sq. m.
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area to be lab =2(9*8+8*6+6*9)
=2(72+48+54)=174*2=348
area of two doors=2(3*1.5)=2*4.5=9
area of four window=4(1.5*1)=6
area to be white washed =348-(9+6)=348-15=333
cost of whitewashing lab =333*1.75=582.75
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