Prepare journal entries to record each of the following purchases transactions of a merchandising company. Show supporting calculations and assume a perpetual inventory system. Mar. 5 Purchased 500 units of product at a cost of $5 per unit. Terms of the sale are 2/10, n/60: the P Mar. 7 Returned 50 defective units from the March 5 purchase and received full credit. invoice is dated March 5 Mar. 15 Paid the amount due from the March 5 purchase, less the return on March 7