Board Thread:Questions and Answers/@comment-31459308-20170306071534/@comment-25404524-20170312004328

Who cares about one penny? It's not like you are another Mr. Krabs. If you check the efficiency of purchase, 40 diamonds per $1.99 makes 20.10 diamonds per dollar, and 36 diamonds per $1.98 makes 18.18 diamonds per dollar. So the 40 diamonds per $1.99 is a better choice than the 36 diamonds per $1.98.