Question 5
The cost of fencing a circular plot at the rate of Rs.15 per m is ` 3300. What will be the cost of flooring the plot at the rate of Rs.100 per sq m?
Solution
Let r be the radius of the circular plot
Perimeter of the plot = $$2\pi\ r$$
Cost of fencing the circular plot at Rs 15 per meter = $$2\pi\ r$$ *15
$$2\pi\ r$$ *15 = 3300
r = 35m
Cost of flooring per sq m = Rs 100
Area of the circular plot = $$\pi\ r^2$$
= 3850 sq m
Cost of flooring the circular plot = 3850*100 = Rs.385000
A is the correct answer.
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