Question

If a boy sells a book for rs 450/-, he gets a loss of 10%,then find cost price. to gain 10%, what should be the selling price

Answer 1

Selling price (S.P) = Rs 450/-

Loss% = 10%

Formula:- original quantity(C.P) = New quantity(S.P) * 100
——————————————
100 - loss%

Thus Cost price(C.P) = 450*100. 45000
—————. =. ————. =. Rs 500/-
100 - 10. 90

Cost. Price (C.P) = Rs 500/-

Profit% = 10%

Formula:- new quantity(S.P) = Original quantity (C.P) * 100 + increase%
——————————————————————
100

Selling price (S.P) = 500 * 100+10. 500 * 110 55,000.
———————— = ——————. =. —————- = Rs 550/-
100 100. 100

Therefore to make a profit of 10% he should sell it at Rs 550/-



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