The following questions are accompanied by three statements (I), (II), and (III). You have to determine which statement(s) is/are sufficient/ necessary to answer the questions.
What is the rate of interest per annum?
I. An amount doubles itself at SI in 10 years
II. The difference between SI and CI on an amount of Rs. 20,000 in 2 years is Rs. 200.
III. The CI occurred in 8 years is more than the principal amount.