Calculate the following measures of financial performance for both 2016 and 2017. Be sure to report items (a) through (e) in percentages

a. Gross profit margin

b. Operating profit margin

c. Net profit margin

d. Times-interest-earned (or coverage) ratio

e. Return on stockholders' equity

f. Return on assets

g. Debt-to-equity ratio

h. Days of inventory

i. Inventory turnover ratio

j. Average collection period