Answer:
The letter A represents where the amount of $20 should be written.
The letter D represents where the amount of $36 should be written.
The ending balance, E, is $154.85.
Mike withdrew $20 at an ATM, so A, which is in the "ATM Withdrawal Debit" box, is $20.
Mike later transferred $36 to his checking account. Transferring means moving away to another place, so that $36 is represented by D, which is in the "Transfer From Savings Deposit" box.
Now, Mike withdrew $20 (-20) and transferred in $36 (36). According to the balance from 3/16, he had $138.85. $138.85 - $20 + $36 = $154.85.
Hope this helped!