$3000 invested at 11% #### Explanation: We can divide $5400 by letting $5400 - x$ be the part invested at 11% and the other $x$ is invested at 9%. We have the equation
$0.11 \left(5400 - x\right) + 0.09 x = 546$. Solving for $x$. We have
$594 - 0.11 x + 0.09 x = 546$
48=0.02x x = 2400
Therefore we have
$2400 invested at 9% $3000 invested at 11%