# RE2 | moonshotai/kimi-k3 | run 1

## Prompt

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

## Response

The original price was **$50**. Since a 20% discount means you pay 80% of the original price, dividing the sale price by 0.8 recovers the original amount.

## Solution

Let \( x \) be the original price. After a 20% discount, the jacket costs 80% of \( x \):

\[ 0.8x = 40 \]

Solve for \( x \) by dividing both sides by 0.8:

\[ x = \frac{40}{0.8} = 50 \]

**Check:** 20% of $50 is $10, and $50 − $10 = $40. ✓

Would you like to try a similar problem, such as working backward from a price that includes sales tax?
