1. A person sold a book for Rs 21 and got a loss percentage which was numerically equal to the cost price. What is the cost price (in Rs) of the book?
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- By: anil on 05 May 2019 02.27 amSelling price of book = Rs. 21 Let cost price = Rs. $$x$$ => Loss % = $$x\%$$ According to ques, => $$frac{(x-21)}{x} imes100=x$$ => $$100x-2100=x^2$$ => $$x^2-100x+2100=0$$ => $$x^2-30x-70x+2100=0$$ => $$x(x-30)-70(x-30)=0$$ => $$(x-30)(x-70)=0$$ => $$x=30,70$$ $$ herefore$$ Cost price (in Rs) of the book = Rs. 30 or 70 => Ans - (C)
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