Growth Fertilizer purchases a gravity settling tank by borrowing the $50,000 purchase price. The loan is to be repaid with four equal annual payments at an annual compound rate of 15%. It is anticipated that the tank will be used for 9 years and then sold for $3,000. Annual operating and maintenance expenses are estimated to be $9000/year. Savings of $15,000/year are estimated over the present filtration system. The firm uses a MARR of 15% for its economic analyses. Perform a sensitivity analysis to determine the effects on the economic feasibility of the plan due to errors in estimating the annual operating and maintenance costs, as well as the savings.