Over the past year, a firm decreased its current assets and increased its current liabilities. As a result, the firm's net working capital: Select one: a. had to increase. b. remained constant. c. had to decrease. d. could have either increased, decreased, or remained constant. e. was unaffected as the changes occurred in the firm's current accounts. Net working capital increases when: Select one: a. inventory is purchased on credit. b. fixed assets are purchased for cash. c. inventory is sold at cost. d. a credit customer pays for his or her purchase. e. inventory is sold at a profit