Part a. The following data exists for Mather Company. 2017 2016 Accounts Receivable Net Sales 560,000 $ 70,000 $ 80,000 410,000 Calculate the accounts receivable turnover and the average collection period for accounts receivable in days for 2017 Part b. 1. Prepare journal entries to record the following transactions entered into by the Castagno Company: 2017 Nov. 1 Sold merchandise on account to Mercer, Inc., for $18,000, terms 2/10, n/30. Nov. 5 Mercer, Inc., returned merchandise worth $1,000. Nov. 9 Received payment in full from Mercer, Inc. 2. Suppose Mercer, Inc. did NOT pay Castango Company until December 1, prepare the journal needed on December 1