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    When the price of a portable hard disk is reduced by 24%, its sale increases by 35%. What is the net percentage change in the total revenue?
    Question

    When the price of a portable hard disk is reduced by 24%, its sale increases by 35%. What is the net percentage change in the total revenue?

    A.

    6.2% increase

    B.

    2.6% increase

    C.

    6.2% decrease

    D.

    2.6% decrease

    Correct option is B

    Given:

    Price decreased by 24%

    Sales increased by 35% 

    Formula Used:

    Use the net percentage change formula for successive changes:

    Net % Change = x+y+xy100 x + y + \frac{xy}{100}​​

    Solution: 

    x = -24, y = +35

    Net % Change = 24+35+(24)(35)100-24 + 35 + \frac{(-24)(35)}{100}​​

    = 11 - 840100 \frac{840}{100}​​

    = 11 - 8.4 = 2.6%

    Thus, 2.6% increase in total revenue.

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