if a pair of jeans costed $21 dollars and they were on sale for 20% off how much did the jeans originally cost

Question

I have to find out how much the jeans costs before they were on sale.

Answer 1

Let the original amount be $y. Then, on sale for 20% means (100-20)/100 * y = 21

i.e. 80% of y=21. So, y=21*100/80=$26.25.

So, the jeans cost $26.25 before they were on sale.