270 gallons tanks installed. 400 homes will need 5 fills a year. Cost per gallon is $1.00.

Let's break down the problem:

### Given:
- Each tank has a capacity of **270 gallons**.
- There are **400 homes** that need fills.
- Each home requires **5 fills per year**.
- The cost per gallon is **$1.00**.

### Step 1: Calculate the total gallons needed per home per year
Each home needs 5 fills of 270 gallons each:
\[
5 \times 270 = 1350 \text{ gallons per year per home}
\]

### Step 2: Find the total gallons needed for all 400 homes per year
\[
1350 \times 400 = 540,000 \text{ gallons per year for all homes}
\]

### Step 3: Calculate the total cost
The cost per gallon is $1.00, so the total cost is:
\[
540,000 \times 1.00 = 540,000 \text{ dollars per year}
\]

### Final Answer
The total cost per year for filling all 400 homes is **$540,000**.

Would you like further details or have any questions about this calculation?

### Additional Questions
1. How many tanks would be needed to store all the fuel required for a year?
2. What would be the total cost if the price per gallon increased to $1.20?
3. How much would each home spend annually on fuel fills?
4. What is the cost per home per fill?
5. How many total fills are needed for all 400 homes in a year?

**Tip:** Always keep track of units when performing calculations to avoid mistakes.

Learn how to calculate the total fuel cost for filling 400 homes with 270-gallon tanks, with 5 fills per year at a cost of $1.00 per gallon. This problem demonstrates key concepts in multiplication and cost calculation, suitable for students in Grades 5-7.

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