Khan, Inc. is a U.S.-based exporting firm that expects to receive payments denominated in both EUR and CAD in one month. Based on today's spot rates, the dollar value of the funds to be received is estimated at $500,000 for the EUR and $300,000 for the CAD. Based on data for the last fifty months, Small estimates the standard deviation of monthly percentage changes to be 8% for the euro and 3% for the CAD. The correlation coefficient between the EUR and the CAD is 0.30. What is the portfolio standard deviation? 5.44% none of the options 6.78% 8.47%