A discounted loan of $1,000 was taken out by a company for 6 months at a 10% simple discount rate. The proceeds were immediately invested for 6 months at a 15% simple interest rate with three partial payments: of $100 at the end of two months, $200 at the end of four months, and a final payment. Find the size of the final payment using the Declining Balance Method. What annual simple interest rate and simple discount rate were realized by the company