It costs

$30,000

to retrofit the gasoline pumps at a certain filling station so the pumps can dispense E85 fuel (85% ethanol and 15% gasoline). If the station makes a profit of

$0.06

per gallon from selling E85 and sells an average of

21,000

gallons of E85 per month, how many months will it take for the owner to recoup her

$30,000

investment in the retrofitted pumps? The interest rate is

1%

per month.