Problem 7: Betty and Bob pay $9500 for a $10,000 9-month T-Bill from the country of Freedonia. a. Algebraically find the associated per annum simple discount rate and the per annum simple interest rate. b. Interest rates fall. They sell the T-Bill, 3 months after purchase to Bertha. She requires a 6% per annum simple interest rate of return for the remaining time. Algebraically find the sale price.doj a hot gailool nonogas c. What was the simple interest rate of return per annum that Betty and Bob achieved? lob ni aoli to e8 adi (alumnot vd)