What is the standard deviation of the returns on a portfolio that is invested in stocks A,B,and C? Twenty five percent of the portfolio is invested in stock A and 40 percent is invested in stock C. 
Definitions:
Inverse Demand
A mathematical representation of demand that expresses price as a function of quantity demanded, typically showing how the price will adjust to achieve market equilibrium.
Cournot Duopolists
Firms in a duopoly (a market with only two producers) following Cournot competition, where each firm decides its production level assuming the other's decision as given.
Total Cost
The complete cost of producing a specific number of goods or services, including both fixed and variable costs.
Bean Sprouts
Edible sprouts derived from the germination of beans, commonly used in Asian cuisine.
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