Answer:
$1220
$500 + $0.3x
Step-by-step explanation:
First of all, Ana makes a guaranteed $500. We set that aside, like a constant.
Now, we proceed. We're old she earns 30% extra on her total sales for the week. This means her earnings will be.
$500 + 0.3x, where x is her total sales for the week. Thus, in a week she made $2400 sales, she'd earn
$500 + 0.3 * 2400
$500 + $720
$1220
That means, she earns $1220 in that week