To estimate the total cost for painting the classroom, let's go through the calculations step by step:

Step 1: Calculate the total area to be covered by two coats of paint

Since two coats of paint are required, the total area to cover will be double the area of the walls: $\text{Total area for two coats} = 900 \, \text{ft²} \times 2 = 1800 \, \text{ft²}$

Step 2: Calculate the number of cans of paint required

Each can of paint covers 75 square feet. So, to cover 1800 square feet, we divide the total area by the coverage per can: $\text{Number of cans} = \frac{1800 \, \text{ft²}}{75 \, \text{ft²/can}} = 24 \, \text{cans}$

Step 3: Calculate the total cost of the paint

Each can costs $24.95. So, the total cost is: $\text{Total cost} = 24 \, \text{cans} \times 24.95 \, \text{\$/can} = 598.80 \, \text{\$}$

Thus, the estimated cost to paint the classroom with two coats is $598.80.

Would you like more details on any part of the solution?

Related Questions:

1. What if the area to cover was 1200 ft²? How many cans would be needed?
2. How would the cost change if each can covered 100 ft² instead?
3. What if a third coat of paint was required? How would this affect the total cost?
4. How can you reduce the cost if you find cans on a discount of 10%?
5. What if you only need to paint three of the four walls in the classroom?

Tip:

Always add a small extra amount to the estimated paint required to account for mistakes or surface texture that might absorb more paint.