If the ratio of principal and the simple interest after 5 years is 4 : 3, then the rate of interest p.a. is:

6% 8% 10% 15%

15%

Total interest \(\Rightarrow \) \(\frac{3}{4}\) × 100 = 75% Total Interest = Rate p.a. × time 75% =  Rate p.a × 5years Rate p.a. = 15%