Kristin's annual income is $32000.
Let A, and T be Kristin's annual income and the income tax total, respectively.
T = p%×28000+(p+2)%×(A-28000)
= p%×28000+ p%×(A-28000) + 2%×(A-28000)
=p%×A+2%×(A-28000)
According to the question,
T=(p+0.25)%×A=p%×A+0.25%×A
p%×A+2%×(A-28000) = (p+0.25)%×A=p%×A+0.25%×A
2%×(A-28000) = 0.25%×A
A = $32000
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