Michael earns a retainer of $220 per week plus a 7.5% commission on all sales. The total Michael‘s sales during the week when he earned $448.50 was:

Question

A. $6513.33

B. $8913.33

C. $3420

D. $3046.67

Please show the working out!!!

Answer 1

$220 is a flat amount of his pay, so

$448.50 - $220 = $228.50 represents the amount earned by commission.

So $228.50 is 7.5% of total sales.

Mathematically, this can be expressed

228.50 = 7.5 / 100 x X, where X is the total sales.

Solve for X by multiplying both sides by the inverse fraction 100/7.5:

X = 228.50 x 100 / 7.5

You'll find this matches one of the options!