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Railways Sample Paper RRB (Group D) 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 :

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


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