I need help with the formula for this question please

Quebec Traffic Company had a fire on March 10, 2020, that destroyed a major portion of its inventory. The salvaged accounting records contained the following information: Sales, January 1 to March 10 $ 360, 600 Net merchandise purchased January 1 to March 10 192, 400 Additional information was determined from the 2019 annual report: Income statement: Sales $ 3,300,090 Cost of goods sold 1, 782, 090 Balance sheet: Merchandise inventory 304, 100 Quebec Traffic was able to salvage inventory with a cost of $106,400. Required: Determine the amount of inventory lost by Quebec Traffic as a result of the fire. Quebec Traffic has a December 31 year-end. (Round the "Gross profit ratio" to the nearest whole percent.) Amount of inventory lost