A number theory problem by ashwin korade

Condition 1:On a certain principle, the interest earned for 7 years is $98. Condition 2:On a certain principle, the interest earned for three and a half year is$490 What is the ratio of both the principles?

Details and assumptions:- The ratio must be Condition 2: Condition 1. If your answer is 2:3, write your answer as 2.3

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