In each of the following questions, a question is followed by information given in three statements. You have to study the question along with the statement and decide the information given in which of the statements is necessary to answer the question. What will be the compound interest earned on a sum in two years?
I. The simple interest on the same amount at the same rate of interest in two years is Rs. 800.
II. The amount becomes more than double at compound interest in 10 years.
III. The simple interest on the same amount at the same rate of interest in three years is Rs. 1,200.