A company uses a perpetual inventory system to record the following events involving a recent purchase of inventory: On August 1, it purchased merchandise for $20,000, terms 1/10, n/30. On August 3, it paid freight costs of $400 on merchandise purchased. On August 6, it returned $900 of merchandise to the supplier. On August 9, it paid the amount due to the supplier. As a result of these events, the company's inventory O increased by $19.500. o increased by $18.909. O increased by $18,305. o increased by $19,309. increased by $19.909