You invest $4000 at 4.7% annual interest compounded annually. which gives the balance in your account (a) in terms of the years from now (t)? selected a. a = 0.047 (4000) t answers: a. a = 0.047 (4000) t b. a t+1 = at + 0.047 and a0 = 4000 c. at+1 = at (1.047) and a0 = 4000 d. a = 4000 (1.047t)

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?