You are estimating your company's external financing needs for the next year. At the end of the year you expect that owners' equity will be $80 million, total assets will amount to $170 million, and total liabilities will be $70 million. How much will your firm need to borrow, or otherwise acquire, from outside sources during the year?

a) $20 million

b) $70 million

c) $150 million

d) $160 million

e) $180 million

f) None of the Above