Wilkins manufacturing has sales of $4.0 million and a gross profit margin of 40%. its end-of-quarter inventories are: a. find the average quarterly inventory and use it to calculate the firm's inventory turnover and the average age of inventory. (assume a 365-day year.) b. assuming that the company is in an industry with an average inventory turnover of 2.0, how would you evaluate the activity of wilkins' inventory?