the internal measure of a cuboidal room are 18m×16m×8m find the total cost of whitewashing if the cost of whitewashing is 7rs per meter.what will be it's cost if ceiling is also whitewashed
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Answer:
l = 18m b = 16 m h = 8m
area of four walls = 2h( l + b )
= 2×8(18+16)
=2×8(34)
=16×34
=544 m square
cost of white washing 1 m square = Rs. 7
cost of white washing 544 m sqaure = 544×7
= 3808 Rs.
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