A loan at a nominal annual interest rate compounded monthly i^(12) = 12% is repaid with 120 monthly payments starting one month after the loan. The amount of the first payment is 600 and each subsequent payment is 5 larger than the previous payment. The loan amount is 58490.887$. On the due date of the 60th payment, the loan is repaid in full with a single payment of Y. Calculate Y.