1. **State the problem:** We need to find the cost of coating a rectangular driveway that measures 15 feet by 20 feet, with a coating cost of 3.00 per square foot. 2. **Formula used:** The cost to coat the driveway is given by the formula: $$\text{Cost} = \text{Area} \times \text{Cost per square foot}$$ 3. **Calculate the area:** The area of a rectangle is: $$\text{Area} = \text{length} \times \text{width}$$ Given length = 15 feet and width = 20 feet, $$\text{Area} = 15 \times 20 = 300 \text{ square feet}$$ 4. **Calculate the total cost:** Multiply the area by the cost per square foot: $$\text{Cost} = 300 \times 3 = 900$$ 5. **Answer:** It will cost 900 to coat the driveway. This means the total cost is 900.