The following table contains beta coefficient estimates for six firms. Calculate the expected increase in the value of each firm's shares if the market portfolio were to increase by 10 percent. Perform the same calculation where the market drops by 10 percent. Which set of firms has the most variable or volatile stock returns? Company Apple Inc. (AAPL) Dell Inc. (DELL) Hewlett Packard (HPQ) Computers and Software Utilities Microsoft Money Central (MSN.com) 2.34 1.47 1.29 American Electric Power Co. (AEP) Duke Energy Corp. (DUK) Centerpoint Energy (CNP) (Click on the icon in order to copy its contents into a spreadsheet.) 0.74 0.46 0.77