Question

The internal dimensions of rectangular hall are
15m x 12m x 4m. There are 4 windows each of
dimension 2mx 1.5m and 2 door each of dimension 1.5m x 2.5m. find the cost of white washing all four walls of the hall,if the cost of white washing is 5 rupee per m².What will be the cost of white washing if the ceiling of the hall is also white washed?​

Answer 1

Answer:

Solution

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Given

Internal dimension of rectangular hall =15m×12m×4m

Now

Area of 4-walls =2(l+b)×h=2(15+12)×4=2×27×4m

2

=216m

2

Area of 4 windows of size =(2×1.5)×4=12m

2

Area of 2 door of size =2×(1.5+1.2)=7.5m

2

So, area of hall to be whitewashed =216−(12+7.5)=216−19.5m

2

=196.5m

2

Given, cost of whitewashing = Rs. 5 per m

2

∴ Total cost =196.5×5=Rs 982.50

Now,

Area of ceiling =l×b=15×12=180m

2

Cost of whitewashing the ceiling =180×5=Rs900

Therefore, the total cost for whitewashing =Rs982.50+900.00=Rs1882.50