Answer:
Mae Ling will make $679.5 in a week if she sells 4300 worth of merchandise.
Explanation:
Given that
Weekly salary of Mae Ling = $400
Commission rate = 6.5%
Mae ling's total weekly earning will be her salary plus her commission on the sales she does in the week.
Given that her sales for the said week are: $4300
Her commission will be:

Now to calculate her total salary, we will add the weekly salary and commission.

Mae Ling will make $679.5 in a week if she sells 4300 worth of merchandise.