1. **State the problem:** We know the price of an 8-minute phone call is 1.20. We want to find the price of a 17-minute phone call. 2. **Identify the formula:** The price is proportional to the duration of the call. So, we use the unit rate formula: $$\text{Price} = \text{Rate per minute} \times \text{Number of minutes}$$ 3. **Calculate the rate per minute:** $$\text{Rate per minute} = \frac{1.20}{8}$$ 4. **Simplify the rate:** $$\text{Rate per minute} = \frac{\cancel{1.20}}{\cancel{8}} = 0.15$$ 5. **Calculate the price for 17 minutes:** $$\text{Price} = 0.15 \times 17 = 2.55$$ 6. **Answer:** The price of a 17-minute phone call is **2.55**.