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1. A single discount equivalent to discount series 20% , 20% and 10% is = ?

A. 50%

B. 48.4%

C. 42.4%

D. 40.4%

Solution:

Single equivalent discount for 20% and 20%

\begin{aligned} = 20 + 20 - \frac{20 \times 20}{100} \\ = 40 - 4 \\ = 36 % \end{aligned}

Single equivalent discount for 36% and 10%

\begin{aligned} = 36 + 10 - \frac{36 \times 10}{100} \\ = 46 - 3.6 \\ = 42.4 % \end{aligned}

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