Answer: You would have to sell $9,333.33 for the first job to be better than the second job offer.
Explanation: We can build in equation with the salary data that we have, it would look like this:
0.08x = 560 + 0.02x
If we solve this equation, x will be the amount of a week sellings that one would have to do in order for the straight comission job to be equal or better than the fixed salary + comission. So,
0.08x - 0.02x = 560
0.06x = 560
x = 560/0.06
x = 9,333.33
Therefore, for the straight comission job to be better than the other one, the worker would have to sell more than $9,333.33.