You chose the correct answer.
Here is the calculation:

I = n ´ P ´ r ´ t

r = I / n ´ P ´ t

where

n ´ P = 10,000
I = 10,000 – 9,525
  = 475
t = 1

therefore,

r = 475 / 10,000
  = 0.0475 or 4.75%

The T – Bill will provide Michelle a 4.75% yield.

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