An investor agrees to invest $10,000 in a friends partnership. The partnership will pay back the investor at the end of a year, but in some years where the partnership makes no money, there is no payment. The investor eventually receives $2000 at the end of years 1 and 3, $3000 at the end of years 6 and 8, and $5000 at the end of year 10; these are the only payments from the investment. Find the yield rate for the investor over the 10-year period.