In the given question below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question. In how many years will a sum of money put at simple interest triple itself?

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1) The interest earned in 4 years is half the sum at simple interest .
2) The rate of interest is 12.5%.
3) The sum doubles itself in 8 years at simple interest.
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