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1. Two successive discount of 10% and 20% are equivalent to a single discount of:

A. 30%

B. 28%

C. 26%

D. 25%

Solution:

Use Formula,
Equivalent Discount = (A + B) -

\frac{AB}{100}

where A = First Discount, B =Second Discount.
Equivalent Discount = (20 + 10) -

\frac{20 \times 10}{100}

Equivalent Discount = 30 - 2 = 28%

Graphic Change Method
100 == 20%(disc.) ⇒ 80 == 10%(disc.) ⇒ 72
Equivalent discount = 28%

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