Please help !!! I need a real expert on this math!!!! if you are not sure please don't answer, Thank you so much for helping!!!!

1, At auction, 6-month T-bills were sold at a discount of 7.420%. What was the simple annual yield r ? (Round your answer to three decimal places.)

Find r =.... %? the answer is not 16.672%, or 14.84% or 7.7% or 14.84%

2, At auction, 2-month T-bills were sold at a discount of 5.510%. What was the simple annual yield r ? (Round your answer to three decimal places.)

Find r =.... %? the answer is not 4.592%, or 40.503% or 1.116% or 33.06%

There is an example for this is : At auction, 2-month T-bills were sold at a discount of 2.500%. What was the simple annual yield r?(Round your answer to three decimal places.) and the true answer is only 2.210%. So if you can solve this out correctly you can do those 2 problems.