Answer:
The amount realized by Casey in the exchange $ 4700
Explanation:
Fair market value of stock received = $4000
Add: cash in transaction that qualifies for deferral under section 351 = $400
Add: assumed mortagae = $600
Less: selling expense = $(300)
Amount realized by casey in exchange = 4000 + 400 + 600 - 300
= $ 4700