Pharoah Beverages Inc. sells cases of bottled water at $25 each and has variable costs of $6 for each case of water. Fixed costs per month are $23,250. Pharoah management is considering adding a new bottled water product line that will be sold at $36 a case and have variable costs of $18 per case. Fixed costs would increase by $3,150 per month, and the new line would comprise 60% of Pharoah's sales revenues going forward. What would be Pharoah's weighted-average contribution margin after the new bottled water line is introduced? (Round answer to 2 decimal places, e.g. 15.25.) Weighted-average contribution margin $