On April 18, 20Y1, Bontanica Company, a garden retailer, purchased $9,800 of seed, terms 2/10, n/30, from Whitetail Seed Co. Even though the discount period had expired, Shelby Davey subtracted the discount of $196 when he processed the documents for payment on May 1, 20Y1.

Discuss whether Shelby Davey behaved in a professional manner by subtracting the discount even though the discount period had expired.