The uncertainty in the stock market led Sam to diversify his investments. However, he still felt that stock options would earn the most, so he left the bulk of his funds in stock options. The table below lists Sam?s earnings from investments last year. What is the average rate of return on his investments?

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Performance (%) Investment Type Amount Invested ($) Mutual Funds 15 300 4.5 GICS 3.0 10 400 Stock Options 150 600 10.2