Answer:
$25,000
Step-by-step explanation:
In the case of exchange of asset the adjusted basis of new asset will be equals to the the adjusted basis of old assets at the time of exchange and any consideration payment resulted from exchange of assets.
In this question the old furniture has adjusted basis of $20,000 at the time of exchange and Mary paid additional $5,000 for the exchange of furniture.
Adjusted Basis = Adjusted basis of old furniture at the time of exchange + Consideration for the exchange of furniture
Adjusted Basis = $20,000 + $5,000 = $25,000