Tracy is taking advantage of a 25% off sale to buy a new coat. If the coat's sale price is $135, what was the original cost?
Let the original cost of the coat be "x".
At a 25% discount, Tracy would pay 75% of the original price:
0.75x = 135
Divide both sides by 0.75 to solve for x:
x = 180
Therefore, the original cost of the coat was $180.