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?
The volume of the slab is 100*100*.5=
<gadget id="calculator">100*100*.5</gadget>
<output>5_000</output>
5000 cubic feet.
So it weighs 5000*150=
<gadget id="calculator">5000*150</gadget>
<output>750_000</output>
750000 pounds.
That means the cost is 750000*$0.02=$
<gadget id="calculator">750000*0.02</gadget>
<output>15_000</output>
15,000 per house.
So the total cost for all 3 houses is $15000*3=$
<gadget id="calculator">15000*3</gadget>
<output>45_000</output>
45,000.

<result>45_000</result>