please help! our professor isn't the best at explaining and the entire class is confused on how to solve this :)

1. What is the rate of return if an investor buys the 6-month Treasury bill at the quoted price/discount? 2. What is the rate of discount investors receive if investors buy the 12-month Treasury bill? 3. What was the yield last year for the 3-month Treasury Bill? NAME COUPON PRICE YIELD 1 MONTH 1 YEAR TIME (EST) GB3:GOV 0.00 0.04 0.04% -4 -153 3:33 PM 3 Month GB6:GOV 0.00 0.05 0.05%-3 - 149 3:34 PM 6 Month GB12:GOV 0.00 0.07 0.07%-3 - 141 3:33 PM 12 Month 1. What is the rate of return if an investor buys the 6-month Treasury bill at the quoted price/discount? 2. What is the rate of discount investors receive if investors buy the 12-month Treasury bill? 3. What was the yield last year for the 3-month Treasury Bill? NAME COUPON PRICE YIELD 1 MONTH 1 YEAR TIME (EST) GB3:GOV 0.00 0.04 0.04% -4 -153 3:33 PM 3 Month GB6:GOV 0.00 0.05 0.05%-3 - 149 3:34 PM 6 Month GB12:GOV 0.00 0.07 0.07%-3 - 141 3:33 PM 12 Month