The overall growth factor of the portfolio over three years is $1.40 \times 0.70 \times 1.20 = 1.176$.

The compound annual growth rate (CAGR) of the portfolio is $\sqrt[3]{1.176} - 1 \approx 5.56\%$. (expressed as a percentage)

The arithmetic mean of the annual returns is $10\%$.

If an investor started with \10,000$, the portfolio's value at the end of the three years would be$$11,760$.