I do not understand why my answer is wrong. According to my textbook, the AMT Exclusion amount for a head of household individual in $2024$ is $$85,700.$ Am I missing something? Problem information below:

Problem $8-58($LO $8-2)($Algo$)$

$[$The following information applies to the questions displayed below.$]$

Corbett's AMTI is $$626,000.$

What is his AMT exemption under the following alternative circumstances?

d$.$ His filing status is head of household.

AMT Exemption

To help ensure that most taxpayers aren't required to pay the alternative minimum tax, Congress allows taxpayers to deduct an alternative minimum tax $(\backslash (\backslash$underline$\{\backslash$mathbf$\{$A M T$\}\}\backslash ))$ exemption amount to determine their alternative minimum tax base. $\backslash (\{\}^\{8\}\backslash )$ The amount of the exemption depends on the taxpayer's filing status. The exemption is phased out $($reduced$)$ by $25$ cents for every dollar the AMTI exceeds the threshold amount.

Exhibit $8-5$ identifies, by filing status, the base exemption amount, the phase$-$out threshold, and the range of AMTI over which the exemption is phased out for $2024\mathrm{.}9$

EXHIBIT $8-52024$ AMT Exemptions