At the beginning of the month, you owned $8,000 of News Corp, $8,300 of First Data, and $8,700 of Whirlpool. The monthly returns for News Corp, First Data, and Whirlpool were 9.40 percent. -2.73 percent, and 11.53 percent. What's your portfolio return? (Do not round intermediate calculations and round your final answer to 2 decimal places.) Portfolio return %