Maths-
General
Easy
Question
The inner circumference of a circular track is 220 m. The track is 7 m wide everywhere. Calculate the cost of putting up a fence along the circumference of outer circle at the rate of Rs 2 per meter
Hint:
Radius of outer circle is the sum of radius of inner circle and width of the track.
The correct answer is: Rs. 528
It is given that Circumference of inner circle = 220 m
2 r =  220
2 ×  × r =  220
r = 35 m
Radius of outer circle = Radius of inner circle +Width of track
= Â 35 + 7 = 42 m
Circumference of outer circle = 2Â r
= 2 ×  × 42
= 264 m
Cost of fencing per meter = Rs. 2
Cost of fencing outer circle = Rs. 2 × 264
= Rs. 528
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