Susan would have to sell more than $69000 to make over 32,500 and less than $163000 to make under $41900
To calculate this you take the income she wants to make and subtract her salary
32500 - 25600 = 6900
you then multiply this by 10 to calculate the commission she needs to earn
6900 x 10 = 69000
Repeat this for the other side of the income scale.