Question

A whole seller gives 10% discount and then another 20%.The total discount is

Answer 1

30 percent is whole discount

Answer 2

A whole seller gives 10% discount and then another 20%. The total discount is 28 %

Solution:

If a % and b % are the two successive discounts then,

$Net\ Discount = (a + b - \frac{ab}{100}) \%$

Given that,

A whole seller gives 10% discount and then another 20%

a = 10 %

b = 20 %

Therefore,

$Net\ Discount =( 10 + 20 - \frac{ 10 \times 20 }{100}) \%\\\\Net\ Discount =( 30 - 2 ) \%\\\\Net\ Discount = 28 \%$

Thus total discount is 28 %

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