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Banking Sample Paper IBPS Clerk (PT) Sample Paper Test-2

  • question_answer
    The radius and the height of a right circular cylinder are increased by 25% and 35% respectively. What will be the percentage increase in its curved area?

    A)  65%                

    B)  63.25%

    C) 58.5% 

    D) 68.75%

    E) None of these

    Correct Answer: D

    Solution :

    Let the initial height and radius be h and r respectively. Curved surved area \[27\pi rh\] after increase, curved surface area \[=2\pi (1.25r\times 1.35h)=3.375\pi rh\] \[\therefore \]Reqd % change \[=\frac{3.375\pi rh-2\pi rh}{2\pi rh}\times 100\]\[=68.75%\] Quicker approach: (Direct formula) % change in area\[=+25+35+\frac{(25)(35)}{100}\] = 60 + 8.75 = 68.75%


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