The internal measures of a cuboid room are 12m*8m*4m* find the total cost of white washing all four walls of a room , if the cost of white washing is rupees 5per m square what wiil be the cost of white washing if the celing of the room is also white washed
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Length of room = 12m
Breadth of room= 8m
Height of room= 4m
C.S.A of room= 2(hl+hb)
= 2[(4)(12)+(4)(8)]
= 2(48)+(32)
=2(80) = 160m square
Cost of four walls of room = 160×5
= 800rs
Ceiling of room = l×b = 12×8 = 108m square
Cost of ceiling room = 108×5 = 540rs
Total cost = 800+540 = 1340 rs
Breadth of room= 8m
Height of room= 4m
C.S.A of room= 2(hl+hb)
= 2[(4)(12)+(4)(8)]
= 2(48)+(32)
=2(80) = 160m square
Cost of four walls of room = 160×5
= 800rs
Ceiling of room = l×b = 12×8 = 108m square
Cost of ceiling room = 108×5 = 540rs
Total cost = 800+540 = 1340 rs
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