Simon company's year-end balance sheets follow. at december 31 2017 2016 2015 assets cash $ 31,800 $ 35,625 $ 37,800 accounts receivable, net 89,500 62,500 50,200 merchandise inventory 112,500 82,500 54,000 prepaid expenses 10,700 9,375 5,000 plant assets, net 278,500 255,000 230,500 total assets $ 523,000 $ 445,000 $ 377,500 liabilities and equity accounts payable $ 129,900 $ 75,250 $ 51,250 long-term notes payable secured by mortgages on plant assets 98,500 101,500 83,500 common stock, $10 par value 163,500 163,500 163,500 retained earnings 131,100 104,750 79,250 total liabilities and equity $ 523,000 $ 445,000 $ 377,500 the company's income statements for the years ended december 31, 2017 and 2016, follow. assume that all sales are on credit: for year ended december 31 2017 2016 sales $ 673,500 $ 532,000 cost of goods sold $ 411,225 $ 345,500 other operating expenses 209,550 134,980 interest expense 12,100 13,300 income taxes 9,525 8,845 total costs and expenses 642,400 502,625 net income $ 31,100 $ 29,375 earnings per share $ 1.90 $ 1.80 (1) compute days' sales uncollected.