What is the equal –payment series for 10 years that is equivalent to a payment series starting with $5000 at the end of first year and increasing by $500 each year over 10 years at interest rate of 4 % compounded annually? Compare your answer with the equal payment series for 10 years when increasing rate of payment is 0.1 (10 %) each year after the first payment of $5000 at the end of first year.