A clock-seller sold a clock by purchasing it at RS 336. The amount of his profit percentage is as much as the amount with which he bought the clock.Hence find the required quadratic equation.

Explanation

Let the cost price of the clock = RS x.
`:.` Profit =RS (336-x) [`:'` selling price RS =336]
`:.` Percentage of profit `=(336-x)/(x)xx100%`
As per question, `=(336-x)/(x)xx100%=x%`
or, `(33600-100x)/(x)=x`
or, `x^(2)=33600-100x`
or, `x^(2)+100x-33600=0`
Hence the required quadratic equation is `x^(2)+100x-33600=0`.