A sum of money becomes 4/3 of itself in 6 years at a certain rate of simple interest. Find the rate of interest.

Let the sum of money be x Rs

Amount = 4 / 3 x

SI = 4/3 x - x

Prt / 100  = x/3 Rs

18xr = 100x

r = 100 / 18

r = 50/9 %

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