I think I know the answer, I just want to double check. ABC Inc. purchases 420 units of an item at an invoice cost of $25,200. A)What is the cost per unit? B) If the goods are shipped f.o.b. shipping point and the freight bill was $1,250, what is the cost per unit if ABC pays the freight charges? C) If these items were bought on 2/10, n/30 terms and the invoice and the freight bill were paid within the 10-day period, what would be the cost per unit?