A mechatronics engineer works to automate the transfer of materials and goods, and the manufacturing process. Their tasks involve identifying areas for task automation, designing, developing and testing potential mechatronic devices, and implementing design solutions.
A typical tea bag has somewhere between a gram and two grams of stuff in it. If the entire contents were nothing but fructose, and that fructose completely dissolved when you made your tea, you'd consume between 4 and 8 calories (carbohydrates contain 4 calories per gram) per cup of tea -- so that's the ceiling.
High end gourmet packages offer better leaf than these low end fannings and dust, plus complex fruit and floral ingredients and muslin pyramids that provide more porous flow. These are mostly in the 40 cent range. So, about 8o% of tea bags cost 20-40 cents. Loose whole leaf artisan-crafted teas: about 8o% of good grade teas cost 25-40 cents a cup