Okay so first I'm going to find out how much I can multiply to find out their total.
Jasmine: 40 ÷ 8 = 5
Ricardo: 40 ÷ 4 = 10
Meaning I just have to multiply them by those
Ricardo: 40 hours = 72 cars
Jasmine: 40 hours = 210 cars
Money
8.50 x 72 = $612
8.50 x 210 = $1785
Difference
1785 - 612 = 1173
Meaning the difference in earnings is $1173
When you hear the word difference it's always subtraction
(sorry if I was rushing my class just finished which I'm doing it in I'll come back to review the answer and solution I gave you later)