A six-month Treasury bill and a nine-month bill both sell at a discount of 12%. a-1. Calculate the annual yield of the six-month Treasury bill. Note: Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. a-2. Calculate the annual yield of the nine-month Treasury bill. Note: Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places. b. Which bill offers the higher annual yield