Question

A profit of 10% is made after giving a discount of 5% on a tv if marked price of tv is 2640. The cost price of tv is

Answer 1

$sp = \frac{mp(100 - d\%)}{100} \\ sp = \frac{2640(100 - 5)}{100} \\ sp = \frac{2640 \times 95}{100} \\ sp = 2508 \\ cp = \frac{sp \times 100}{p\%} \\ cp = \frac{2508 \times 100}{110} \\ cp = 2280$
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