10. The inside circumference of a circular track is 660 m. The track is 7 m wide. Find the cost of 10 per square metre.
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Step-by-step explanation:
Circumference of inner side = 220m
⇒2πr=220⇒r=
44
220×7
=35m
Now, width of track =7m
∴ Outer radius =35+7=42m
Therefore outer circumference =2πR=2×
7
22
×42=264m
∴ Cost of fencing = Rs. (264×2) = Rs. 528
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