Hearthstone sells commercial kitchen equipment. At December 31, 2015, Hearthstone' amounted to $ 750,000. During the first week of January 2016, the company made only one purchase and one sale. These transactions were as follows: Jan. 5 Purchased 90 machines from Rock Creek Corporation. The total cost of these machines was $ 60,000. terms 3/10, n/60. Jan. 10 Sold 45 different types of products on account to Harolds. Inc The total sales price was $ 42,000 terms 5/10, n/90. The total cost of these 45 units to Hearthstone was $ 15,000. (net of the purchase discount). Hearthstone has a full-time accountant and a computer-based accounting system. It records sales at the gross sales price and purchases at net and maintains subsidiary ledgers for accounts receivable, inventory, and accounts payable