# RE2 | deepseek/deepseek-v4-pro | run 2

## Prompt

After a 20% discount, a jacket costs $40. What was the original price? Show your work.

## Response

After a 20% discount, the sale price represents **80% of the original price** (because 100% – 20% = 80%).

Let \( x \) be the original price.

\[
0.80x = 40
\]

Divide both sides by 0.80:

\[
x = \frac{40}{0.80} = 50
\]

**The original price was $50.**

Check: 20% of $50 is $10. $50 – $10 = $40. ✅

Would you like to see a shortcut formula you can use for similar discount problems?
