QuestionA person invested $\$ 8100$ for 1 year, part at $7 \%$, part at $11 \%$, and the remainder at $13 \%$. The total annual income from these investments was $\$ 915$. The amount of money invested at $13 \%$ was $\$ 300$ more than the amounts invested at $7 \%$ and $11 \%$ combined. Find the amount invested at each rate.
The person invested $\$$ $\square$ at $7 \$$ $\square$ at 11 and \$$\square$at$13 \%$.