(1 point) Problem 3 - Unknown Time & Unknown Interest Rate At an effective annual interest rate of 9%, the following two streams of payments are equivalent: () A payment of 100 at the end of the first year, a payment of 400 at the end of the 5th year, and a payment of 800 at the end of the 9h year. (i) A single payment of 1300 at time T. a) Estimate the time of the single payment using the method of equated time: T- b) Calculate the exact time of the single payment. T