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2016-03-15T15:05:18+05:30

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Initial curved surface area of cylinder = 2πr h
new radius, R = r + 75% of r = 1.75 r
new height, H = h - 50% of h = 0.5 h
new curved surface area =2πRH = 2π×(1.75 r)×(0.5 h)
                                        = 2πrh ×0.875 
area decreased = 2πrh - 2πrh ×0.875 =  0.125 ×2πrh
percent decrease = [(0.125
×2πrh)/(2πrh)]×100 = 12.5%
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