Answer:
(a) Discount on bonds payable ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LIABILITIES
 
(b) Interest expense (credit balance) ⇒ WHEN INTEREST EXPENSE IS INCLUDED IN THE INCOME STATEMENT IT HAS A DEBIT BALANCE, WHEN IT HAS A CREDIT BALANCE IT MEANS IT IS A LIABILITY AND MUST BE REPORTED IN THE BALANCE SHEET 
 
(c) Unamortized bond issue costs ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET, IT IS A CONTRA LIABILITY ACCOUNT
 
(d) Gain on repurchase of debt ⇒ SHOULD BE REPORTED IN THE INCOME STATEMENT AS PART OF OTHER GAINS AND LOSSES
 
(e) Mortgage payable (payable in equal amounts over next 3 years) ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LIABILITIES (UNDER CURRENT AND LONG TERM LIABILITIES)
 
(f) Debenture bonds payable (maturing in 5 years) ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LONG TERM LIABILITIES 
 
(g) Notes payable (due in 4 years) ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LONG TERM LIABILITIES
 
(h) Premium on bonds payable ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LIABILITIES (REDUCES BONDS PAYABLE)
 
(i) Bonds payable (due in 3 years) ⇒ SHOULD BE REPORTED IN THE BALANCE SHEET UNDER LONG TERM LIABILITIES