Answer: conduct a scientific experiment that shows price choices with controlled variables.
Explanation: Conducting a scientific experiment will give Quality Building Materials Inc the most competitive price to set for its weather blanket. This experiment needs to be based on controlled variables so that the company can generate useful information. This is the most accurate method to use as it is based on facts and figures that apply to that company personally instead of for example over - generalising by using Internet searches or comparing with price lists.