The accessories department buyer had a back to school promotion on backpacks and messenger bags. The bags that had a regular price of $99.99 were promoted at $49.99 . There was also an additional coupon in sent to shoppers in the loyalty program for 20% off. Calculate the following: a. Final selling price for the backpacks or messenger bags. b. Markdown percentage to the customer. c. Markdown percentage journalized by the retailer.