10 % discount and then 20 % discount in succession is equivalent to total discount of....... %

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7.Profit and Loss

medium

$10 \%$ discount and then $20 \%$ discount in succession is equivalent to total discount of.......$\%$

A

$15$

B

$30$

C

$24$

D

$28$

Solution

$10 \%, 20 \%$ discount is equivalent to

Let us consider marked price as $100 ₹$

$S.P.$ $=(100-10) \% \times(100-20) \% \times 100$

$=.9 \times .8 \times 100$

$Rs.=72$

Discount $\%=\frac{100-72}{100} \times 100=28 \%$

Standard 13

Quantitative Aptitude

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