Indicate whether a debit or credit is necessary to decrease the normal balance of each of the following accounts:
a. Buildings
b. Interest Revenue
c. Bob Norton, Withdrawals
d. Bob Norton, Capital
e. Prepaid Insurance
f. Interest Payable
g. Accounts Receivable
h. Salaries Expense
i. Office Supplies
j. Repair Services Revenue
k. Interest Expense
1. Unearned Revenue
m. Salaries Payable
n. Furniture
o. Interest Receivable