Siskiyou Corp. has cash of exist100,000: short-term notes payable of exist100,000: accounts receivables of exist300,000: accounts payable of exist135,000: inventories of exist350,000: accrued expenses of exist75,00, and long-term notes payable of exist250,000. What is the firm's net working capital? A) exist390,000 B) exist175,000 C) exist440,000 D) exist210,000