Question

The inner circumference of a circular track is 220 m. The track is 7 m wide everywhere. Calculate the cost of putting a fence along the outer circle at the rate if rupee 2 per meter.
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Answer 1

Answer:

Inner circumference=2πr=2(22/7)r=220

r=220×7/44=35=radius of the inner circle

Radius of the outer circle=35+7=42

Circumference of the outer circle=2(22/7)42

=12×22=264

cost=264×2=528 Rs