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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-1

  • question_answer
    When the price of a radio was reduced by 20%, its sale increased by 80%. What was the net effect on the sale?

    A)  44% increase   

    B)         44% decrease   

    C)         66% increase   

    D)         75% increase                

    Correct Answer: A

    Solution :

    Let the original price be x and sale be of y units. Then, the revenue collected initially \[=x\times y\] Now, new price \[=0.8x,\]new sale \[=1.8\text{ }y\] Then, new revenue collected \[=1.44xy\] % increase in revenue             \[=\frac{0.44\,xy}{xy}\times 100=44%\] Shortcut Method Net effect \[=-20+80+\frac{\left( -20\times 80 \right)}{100}\]             \[=60-16=44%\]


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