Question

how to find market price when selling price and discount is given

Answer 1

MP=[100/(100-discount)]*SP

Answer 2

Market Price is the price which on which some discount is given and then the item is sold at a price which is the selling price. Let d% discount is given and it is sold at price P after the discount. So we need to find the market price. 

Let the market price be M.
d% of M = $\frac{d}{100} \times M= 0.01Md$
So P = M - 0.01Md
⇒ P = M(1-0.01d)

⇒ M = $\frac{P}{1-0.01d}$

So market price is $\frac{P}{1-0.01d}$