Your employer offers a 401k plan, and matches your contributions dollar for dollar up to $5k. Last year you contributed $5k to the 401k to maximize your employer match, and set it to invest in an equity index fund. Assume you made the investment at the beginning of the year. The index fund returned 8% over the course of the year. What rate of return did you generate on your contributions to 401k for the year? Enter answer in percents, to two decimal places