What will be the ratio of simple interest earned by certain amount at the same rate of interestfor 4 years and 6 years ?

Let p be the principle amount

And R% be the rate of interest

Then, required ratio = $\frac{\frac{P\times 4\times R}{100}}{\frac{P\times 6\times R}{100}}$ 

$\Rightarrow \frac{4PR}{6PR}$= 2:3