The price fluctuations of 4 scrips in a stock market in the four quarters of a year are shown in the table below. Four different investors had the following portfolios of investment in the four companies throughout the year : Portfolios Investor 1 : 10 of A, 20 of B, 30 of C and 40 of D Investor 2 : 40 of A, 10 of B, 20 of C and 30 of D Investor 3 : 30 of A, 40 of B, 10 of C and 20 of D Investor 4 : 20 of A, 30 of B, 40 of C and 10 of D Stock Market Performance