Answer:
On January 1, 2021, the journal entry to record the first installment payment will include a
debit to Interest Expense for $24,000
Explanation:
a) Data and Calculations:
January 1, 2020:
Mortgage note payable = $160,000
Note payable period = 6 years
Interest rate  16%
January 1, 2021:
Annual interest expense = $24,000 ($160,000 * 15%)
Principal repayment = $18,278 (42,278 - 24,000)
Annual cash payment to the creditor = $42,278
Complete journal entries on January 1, 2021:
Debit to interest expense of $24,000
Debit to Mortgage Payable $18,278
Credit to Cash = $42,278