A benchmark equally-weighted index is comprised of three stocks. Yesterday the three stocks were priced at $12, $20, and $60. The number of outstanding shares for each is 600,000 shares, 500,000 shares, and 200,000 shares, respectively. If the stock prices changed to $16, $18, and $62 today respectively, what is the 1-day rate of return on the index?

Please show workings.

6.16%

4.35%

8.89%

7.42%