The guideline formula for calculating the price when selling healing tea to the shop is: (BWB-200)/7+10

Example:	MotherGoose's unstatted Brewing Bonus is 360: (360-200)/7+10 = A$32.86
	She should therefore sell her tea to the shop for A$32.86 or less.
	(The shop then adds a 10% markup for tea so the shop-list price for her tea would be A$36.14)