Please help I cannot seem to get parts B and C

Analyzing Inventory for Two Retail Grocery Companies Required a. Calculate gross profit margin for each year for both companies. Note: Round percentage to one decimal place (for example, enter 6.7% for 6.6555% ). b. Determine the common-size inventory for each year for both companies. Note: Round percentage to one decimal place (for example, enter 6.7% for 6.6555% ). c. Compute inventory turnover and days average inventory outstanding for 2018. Note: Do not round until your final answer; round your final answer to one decimal place (for example, enter 6.8 for 6.77555). d. Based on the metrics in parts a,b, and c, answer the following questions. Which company holds less inventory proportionately? Which company earns a higher gross profit margin? Which company turns its inventory more quickly? Which company is more efficient with its inventory