Consider a bank with the following income statement: It has $100 in loans with an interest rate of 5 percent; $50 in security holdings, paying 10 percent; noninterest income of $10; $100 in savings accounts that have an interest rate of 2.5 percent; and other expenses of $15. What is this bank's total income?
a) $20
b) $2.50
c) $160
d) $17.50