Answer:
-$12.54.
Step-by-step explanation:
The balance at the end of Wednesday will be equal to the balance on Monday plus the deposit less the bills that he pays with the cheks. So, the balance will be equal to:
$52.03 + $50 - $42.07 - $72.50
-$12.54
So, the checkbook balance at the end of Wednesday is -$12.54.