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The inner circumference of a circular track is 440 m. The track is 14 cm wide. Find the cost of leveling it at 20 paise/square m.

Also find the cost of fencing along outer circle at Rs.2/meter.



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ATQ, 2*22/7*r=440
or,r=70m. d=140m.
outer d=140+.14=140.14
area of inner circle=22/7*r^2=15400 sq.m and area of outer circle=πr^2=15909.54sq.m
area of the path=15909.54-15400=509.54sq.m*20=rs.1019.8
circum. of outer circle=2πr=440.44
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