Convert each part of the Ratio to Percentage:

3:5

The sum of ratio = 3+5 = 8

First part = $\frac{3}{8}$

Second part = $\frac{5}{8}$

Percentage of first part =$\frac{3}{8}\times 100$= 37.5%

Percentage of second part =$\frac{5}{8}\times 100$= 62.5%