Calculating ROI
1. Tina sells cookies. What is Tina's ROI?
Production cost: $7.65/box of cookies
Selling price: $12/boxes of cookies
ROI:

2. Sherry sells purses. What is Sherry's ROI?
Production cost: $17.20/purse
Selling price: $30/purse
ROI:

3. Chris provides tree trimming services. What is Chris's ROI?
Production cost: $48.89/tree trim
Selling price: $65/tree trim
ROI: