I think everyone is overthinking this - the ARE handbook answer is correct.
You have a change order construction cost that is $108,810.
You apply a 10% profit on that cost (OHP, markup, whatever you want to call it) = $10,881.
You add those together and get $119,690 (or you could multiply by 1.1) total change order
This is $19,690 over what is left in the Construction Budget. The Construction Budget always includes OHP.
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