Calculate the cost of goods sold, gross margin, & ending inventory using FIFO method and the following information Cullumber Company sells leather saddles and equipment for horse enthusiasts. Cullumber uses the perpetual inventory system. The following schedule relates to the company's inventory for the month of May:

$\backslash$table$[[,,,$Cost,Sales$],[$May $1,$Beginning inventory,$210$ units,$$136,500,],[5,$Sale,$140$ units,,$$118,300$