hmmmm you need to know the price after the discount,
if you found out just apply the number to the aquations bellow,
assume X = original price , therefore
X - (X* 25%) = the current price
X - .25X = the current price
.75X = the current price then you will divide the current price by .75 and get X
and you can check your answer buy
X* 25% = X*.25 = the answer then minus the X = the current price