The amounts invested in the companies, $P$ and $Q$, in $2006$ are in the ratio $8:9$
The annual rate of interest in the companies $P$ and $Q$ are $6\%$ and $4\%$ respectively in the year $2006$
∴ The amounts received after one year as interests from companies $P$ and $Q$ would be in the ratio
$\left(8\times \dfrac{6}{100}\right) : \left(9\times \dfrac{4}{100}\right)$
$= 48:36$
$={4:3}$