Answer:
10%
Step-by-step explanation:
Since there is no residual value, the full amount invested should be used to calculate the average rate of return. The average rate of return is determined as the average income divided by the invested amount.
If the total income was $10,980,000 over 20 years, the average income is:
![I_(avg) =(\$10,980,000)/(20)=\$549,000](https://img.qammunity.org/2021/formulas/business/college/z2eim8d3yde4f8w7px8e0gm9iild0ef5ie.png)
If the invested amount was $5,490,000, the average rate of return is:
![r_(avg) = (\$549,000)/(\$5,490,000)=0.10 = 10\%](https://img.qammunity.org/2021/formulas/business/college/1fpiw64swmt3usupvjjyyv0yb8h0evsuph.png)