Toby is filling his swimming pool for the summer. The pool normally takes 50 hours to fill. He knows his hose runs at 100 gallons per hour. Water costs 1 cent for 10 gallons. How many dollars does it cost to fill the pool?
The pool holds 5000 gallons of water because 50 x 100 = 
<gadget id="calculator">50*100</gadget>
<output>5_000</output>
5000.
Every gallon costs $.001 because $.01/10 = $
<gadget id="calculator">.01/10</gadget>
<output>0.001</output>
.001.
It costs $5 to fill the pool because 5000 x $.001 = $
<gadget id="calculator">5000*.001</gadget>
<output>5</output>
5.

<result>5</result>