The length, breadth and height of a room are 5 m, 4 m and 3 m, respectively. Find the cost of whitewashing the walls of the room and ceiling at the rate of Rs. 7.50 per m square
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to find the cost we have to first find the area
l is length, b is breadth and a is area
a=l×b
=4×3
=12
therefore, area =12 m square
{note: now whitewashing the walls of the room and ceiling at the rate of Rs. 7.50 per m square would be 12 multipled by 7.50}
cost of whitewashing the walls = 12×7.50 =12×7.5 (because the 0 doesn't matter and will make the calculation easier)
= 90.0 = 90 (again, because the 0 doesn't matter)
answer: Rs. 90
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