Providing printers in the general office is a considerable expense for the department. The cost of renting and servicing a full form printer is $7500 per year. The department head is now considering purchasing the printer in one go. The cost of purchasing a printer is $218,000 and the annual cost of maintaining it is $1,000. If the useful life of a full form printer is assumed to be 20 years, how many full form printers could the department afford to rent each year and break even with the cost of one full form printer? Let the interest rate be 6% per year