Suppose you invest $7500 into savings account that 1.5010 annual interest for the first 3 pays then years, 2.2% annual interest for the next 2 years, and then 3.1 annual interest for each year after. (a) How much will be in the account at the end of 8 years? a (6) If someone plans to invest at this bank into similar account, how much would they need to invest now in order to $20000 in the account at the end of 10 have exactly years