What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years?

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A. 8 : 4
B. 2 : 3
C. 1 : 3
D. 1 : 4

Let the principal be P and rate of interest be R%. So Required ratio = [(P x R x 6/100) / (13 x R x 9/100)] = 6PR/9PR = 6/9 = 2 : 3

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