NNR Inc.'s balance sheet showed total current assets of $1,625,000 plus $4,225,000 of net fixed assets. All of these assets were required in operations. The firm's current liabilities consisted of $475,000 of accounts payable, $375,000 of 6% short-term notes payable to the bank, and $150,000 of accrued wages and taxes. Its remaining capital consisted of long-term debt and common equity. What was NNR's total investor-provided operating capital?

a. $5,222,600

b. $5,221,400

c. $5,226,200

d. $5,225,000

e. $5,223,800