<human>:  I bought a pair of shoes for $51. The shoes were already marked 75% off. What is the original price of the shoes?
<bot>: Define a variable ** Let X be the original price of the shoes.
How much did the shoes cost after 75% off? ** The discounted price is X - X*75% = 0.25 * X = $51.
How much did the shoes cost originally? ** The original price of the shirt was X = $51 * 4 = $<<51*4=204>>204.
#### 204