We just have to find the closest number that can be multiplied by 32 and still be under 300. Do this by following this step:
Divide by 32 on both sides.
x < 9.375
We can't buy 9.375 sweatshirts though, and we can't add more decimals or it will go over 300, so you round down to 9.
Dominique can buy 9 sweatshirts without going over $300!