A company wants to buy a lease for a mine that has four more years of productive life. It estimates that the returns will be $2869 at the end of the first year, $52894 at the end of both second and fourth year, and $66525 at the end of the third year. Using an interest rate of 8.3% p.a., the net present value if the lease costs $100000 is: (Give your answer to the nearest cent, omitting the dollar sign.)