Answer:
20%
Explanation:
We were given a price at $50 on sale for $40. To get the markdown percentage, take the amount of money you've discounted the merchandise at and divide it by the sales price.
$50 sweaters, you can put them on sale for $40.
![50 - 40 = 10](https://img.qammunity.org/2022/formulas/mathematics/high-school/s0bah3xdb1f7z8anargxpdo78ij3nvjg6e.png)
The difference between these two prices is $10.
Now, we need to add the amount of which it was marked down
![10 + 10 = 20](https://img.qammunity.org/2022/formulas/mathematics/high-school/uyqccfujykd747k51r4tbckrq6s93ypfdk.png)
Therefore, the watch has been marked down by 20%.