# If the ratio of principal and the simple interest of 5 years is 10:3, then the rate of interest is:

**Answer: (4) 6% **

**Explanation:-**The ratio of principal and the simple interest of five years = 10: 3

Then, the percentage of simple interest of five years = 30%

So, the rate of simple interest = 30/5

= 6%

Hence, the answer is (4) 6%.