On December 31, 2015, Company A reports total assets of $4,500,000 and total equity of $2,345,000. All liabilities are current (the company has no long-term debt). The company has a current ratio of 0.7. How much is the company's working capital? Select one: a. $1,508,500 b. $1,641,500 c. -$646,500 d. $3,078,571