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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

hintHint:

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 straight pi r  =   220
    2 × 22 over 7 × r  =   220
    r  =  35 m
    Radius of outer circle = Radius of inner circle +Width of track
    =  35 + 7 = 42 m
    Circumference of outer circle = 2 straight pi r
    = 2 × 22 over 7 × 42
    = 264 m
    Cost of fencing per meter = Rs. 2
    Cost of fencing outer circle = Rs. 2 × 264
    = Rs. 528

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