You are evaluating the inventory management efficiency of two retail companies, RetailMart and SuperStore, in the fashion industry.

Requirements:

1. RetailMart had cost of goods sold (COGS) of $200 million and an average inventory of $40 million for the fiscal year 2023. SuperStore recorded COGS of $250 million and an average inventory of $50 million during the same period.
2. Calculate the inventory turnover ratio for both companies.
3. Discuss which company demonstrates better inventory turnover efficiency.