tax question(schweser) she, understand, question, investor

Makavelim3

On Page 248, Book 1 of Schweser,
about Q23, answer says “If investor pays current taxes at 20% and is willing to give up $2000
in consumption,she can contribute $2500 to TDA…”
i can’t understand this answer..
i think, if you give up $2000, you can contribute to $2000 to TDA and 2000*(1-0.2)=$1600 to TEA…
please correct my understanding..