The inner circumference of a circular track is 176 m. The track is 7 m wide. Calculate the:-
(a) area of the track.
(b) cost of putting up a fence along the outer circle at the rate of rupees 12 per metre. (Use pie= 22/7)

Area of the track is 1386 metre square and the cost of putting fence is Rs. 2640.
Radius of the inner circle is 176* 2*7/22= 28cm 
Radius of outer circle is 28+7= 35m
Area of the track will be outer area-inner area 22/7 *35*35 - 22/7*28*28= 1386 metre square
Cost of fencing 1 m=Rs.12
=12*220= Rs.2640

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The area of circle is 77/2=38.5
The cost of fencing =452

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Area of the track is 1386 metre square and the cost of putting fence is Rs. 2640.
Radius of the inner circle is 176* 2*7/22= 28cm?
Radius of outer circle is 28+7= 35m
Area of the track will be outer area-inner area 22/7 *35*35 - 22/7*28*28= 1386 metre square
Cost of fencing 1 m=Rs.12
=12*220= Rs.2640