John is laying the foundation for 3 homes. Each home needs a slab of concrete that is 100 feet by 100 feet by .5 feet. Concrete has a density of 150 pounds per cubic foot. A pound of concrete cost $.02 per pound. How much does the foundation cost?
Let's be accurate as possible. Think before you answer.
45000
The volume of the slab is 100 * 100 *.

5 = 5000 cubic feet.

So it weighs 5000 * 150 = 750000 pounds.

That means the cost is 750000 * $0.

02 = $15,000 per house.

So the total cost for all 3 houses is $15000 * 3 = $45,000.

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The answer: 45000