(15') A benchmark market value index is comprised of three stocks. Yesterday the thre stocks were priced at $12,$20, and $60. The number of outstanding shares for each i 600,000 shares, 500,000 shares, and 200,000 shares, respectively. The stock prices changed to $16,$18, and $62 today, respectively. (a) (5') What is the average market value of the three stocks yesterday? (b) (5') What is the average market value of the three stocks today? (c) (5') what is the 1-day rate of return on the index