The internal measures of a cuboidal room are 12 mx 8 mx 4m.Find the total cost of whitewashing all four walls of a room, if the cost of white washing is ₹5 per
m²? What will be the cost of white washing if the ceiling of the room is also whitewashed?
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Answer:
Dimensions =12m,8m,4m
lateral surface area=2(l+b)h
2(12+8)4=8×20=160m²
cost RS.5perm²
total cost =160×5=RS.800
area of ceiling=12×8=96m²
so,cost=RS 5×96
RS =480
total cost=800+480
=1280
RS.1280
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