In economics, trade is considered as an important tool to make everyone better off. Before the paper currency, people used to trade goods and services in exchange for goods and services and the concept is called barter trade. Megan has opted for the concept of economics which is called trade can make everyone better off.
The pharmacist needs to measure out 17.5 grams of the 50% powder and 17.5 grams of the 90% powder and should end up with 35 grams of the 70% powder thus making for an easy method of calculation for mixing the two powders.
Manufacturing Overhead sometimes also referred as Factory Overhead includes only those costs which are directly traceable to the production of a product i-e, Direct labor and Material Costs.