Please explain the process on how to obtain the inventory turnover for 2016 & 2017

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 2016 -$ 532,000Cost of goods sold $ 411,225 2016- $ 345,500Other operating expenses209,550 2016 - 134,980Interest expense12,100 2016- 13,300Income taxes9,525 2016- 8,845Total costs and expenses642,400 2016 502,625Net income$ 31,100 2016 $ 29,375Earnings per share$1.90 2016- $1.80