It costs $35,000 to retrofit the gasoline pumps at a certain filling station so the pumps can dispense E85 fuel. 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 $35,000 investment in retrofitted pumps? The interest rate is 0.75% per month.