For the year ended December 31, 2015 Alpena Inc. (Alpena) had revenues of $750,000, of which 80 percent were on credit.

Its accounts receivable turnover ratio for 2015 was 8.39. Accounts receivable on December 31, 2014 was $68,000. Calculate the effect on the average collection period of accounts receivable and the accounts receivable turnover ratio if the following additional transactions occurred during 2015. Consider the effect of each transaction or economic event separately.

a. Alpena, which uses the percentage-of-credit-sales method of estimating the bad debt expense, wrote off an additional $500 of accounts receivable.

b. Alpena collected an additional $8,000 of accounts receivable from customers.

c. Alpena recognized additional cash revenue of $12,500.

d. Alpena recognized additional credit revenue of $12,500.

e. Alpena recorded an additional bad debt expense of $1,000.