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1. The single discount equivalent to the discount series of 20%, 10% and 5% is = ?

A. 11.66%

B. 31.6%

C. 35.66Z%

D. 32%

Solution:

Single equivalent discount for 20% and 10%

\begin{aligned} = 20 + 10 - \frac{20 \times 10}{100} \\ = 30 - 2 \\ = 28 % \end{aligned}

Single equivalent discount for 28% and 5%

\begin{aligned} = 28 + 5 - \frac{28 \times 5}{100} \\ = 33 - 1.4 \\ = 31.6 % \end{aligned}

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