The outer edge of a circular running track is 440 m long. If it is widened by 5
m all around, find the cost of widening it at the rate of ₹8 per 
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☆SOLUTION ☆
Perimeter of track =2πr
2πr=440m
u=44440×7=76m
Radius of road=70+5=75m
Area of road =πr2
=722×75×75
=17678.57m2
Area of track=πr2=722×70×70m2
=220×70m2=15400m2
Area of widening road= Area of road − Area of track
=17678.57−15400
=2278.57m2
1m2 costs =Rs. 8/−
2278.57 costs =Rs. 8×2278.57/-
=Rs. 18228.56.
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