Use the table for the question(s)below.
Consider the following covariances between securities: 
-What is the variance on a portfolio that has $3000 invested in Duke Energy,$4000 invested in Microsoft,and $3000 invested in Wal-Mart stock?
Definitions:
Variable Cost
Costs that change in proportion to the level of production or sales volume.
Net Operating Income
A company's total income from its operations, excluding taxes and interest.
Monthly Sales
The total revenue generated from sales activities during a specific month.
Target Profit
The specific amount of profit a company aims to achieve within a specific period.
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