Question

An article marked at 800 rupees is sold at a discount of 10% find its cost price if the dealer makes a profit of 20%. Also, find the profit percent if no discount had been allowed

Answer 1

$mp = 800 \\ \ discount = 10\%\\ sp = \frac{90}{100} \times 800 = 720 \\ profit = 20\% \\ then \: sp \: = 120\%cp \\ cp = \frac{100}{120} \times 720 = 600$
the cost price of the article is 600