What is the rate of interest at which Rs.150 becomes Rs. 220 in 10 years?

11/3%

12%

14/3%

14%

The formula for simple interest is:

Simple Interest (SI) = (Principal x Rate x Time) / 100

Rearrange the formula to solve for Rate (R):

R = (SI / Principal) x (100 / Time)

Plug in the values:

R = (70 / 150) x (100 / 10)

R = 0.4667 x 10

R = 14/3

R = 4.67 (approximately)

So, the rate of interest is approximately 4.67% or 14/3%.