Successive discounts of 20 and 10 is equivalent to a single discount of howmany percent ........

Quant (SSC) Profit and loss

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Successive discounts of 20% and 10% is equivalent to a single discount of howmany percent?

10%

18%

28%

40%

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Explanation:

To solve this question, we can apply the net% effect formula
= (x + y + xy/100)%
By the net% effect formula, we get
x = – 20%, y = – 10%
= (-20 - 10 + 20 x 10 /100)
= – 30 + 2 = – 28% (Negative sign shows the Loss or Discount)
Hence, Single Equivalent discount will be 28%.