The working capital of a firm is calculated as

Working capital refers to the amount of money that a company has available to fund its daily operations. It is calculated by subtracting a company's current liabilities from its current assets. Current assets include items such as cash, inventory, and accounts receivable, while current liabilities include accounts payable, taxes owed, and other short-term debts that are due within a year. The formula for working capital is as follows: Working Capital = Current Assets - Current Liabilities Therefore, the correct option is (a) current assets minus current liabilities.