Charlie Shine has written a self-improvement book. The following are its pricing and cost details:

Selling price$18.00 per book

Variable cost per unit:

Production$3.50

Selling & administrative1.90

Fixed costs:

Production$33,600 per year

Selling & administrative15,540 per year

Assume the variable production cost were each decreased by $0.36 per book. What would the new contribution margin % be?

Group of answer choices

72%

53%

68%

79%