Magenn Power in Ottawa, Ontario, sells a rotating, bus-sized helium-filled electricity generator that floats 122 m above the ground. It sells for $10,000 (with helium) and will produce 4 kilowatts of electricity at its ground station. If the cost of electricity is $0.08 per kilowatt-hour, how many months must a purchaser use the system at full capacity to recover the initial investment at an interest rate of 12% per year compounded monthly? Assume 30 days per month.