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

Example:	WitchyPoo's unstatted Brewing Bonus is 460: (460-200)/7+10 = A$47.14
	She should therefore sell her tea to the shop for A$47.14 or less.
	(The shop then adds a 10% markup for tea so the shop-list price for her tea would be A$51.86)