QUESTION 19 Which of the following account titles is normally NOT used in a periodic inventory system? a. Transportation-in. b. Purchases. c. Purchase Returns and Allowances. d. Sales Commission Expense. QUESTION 20 The credit terms, 2/10, n/30, indicate that a: two discount can be deducted the invoice is paid before the tenth day following the date of the sale. b.two percent discount can be deducted for a period up to thirty days following the date of sale. c. ten percent discount can be deducted if the invoice is paid within two days following the date of sale. d.two percent discount can be deducted if the invoice is paid after the tenth day following the sale, but before the thirtieth day. QUESTION 21 Which of the following is considered a period cost? a.cost of merchandise purchased. b.transportation costs on goods received from suppliers. c. advertising expense for the current month. d.return of merchandise