A laboratory is 9 metre long 8 m broad and 6 m high it has two doors each of size 3 m into 1.5 m and 4 windows each of size 1.5 m into 1 m find the cost of whitewashing the walls of the laboratory @ rupees 1.75 per square metre
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tOTAL COST of panting the wall=
330.75
total area of wall for paniting=189m^2
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