With the total sales of $2,733, the sales over $2,000 is $733. The commission she will receive is equal to the product of $733 and the decimal equivalent of the commission. That is,
commission = (0.04)($733)
commission = $29.32
The total compensation she will receive is the summation of the commission and weekly salary.
total compensation = $29.32 + $500
total compensation = $529.32
This week, Sandi will receive a total compensation of $529.32.