One year ago, Sook-Yin allocated the funds in her portfolio among five securities in the proportions listed below. The rate of return on each security for the year is given in the third column of the table. Security Proportion invested (%) Rate of return for the year (%) Company A shares 15 14 Province B bonds 20 10 Company C shares 10 13 Units in Fund D 35 12 Company E shares 20 27 Calculate the rate of return for the entire portfolio.