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mdp448

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The question is:

The following function, L, gives the approximate percent literacy rate in India

*t*years after 1900.

L(t)=5.3 x 1.025^t

Which of the following equivalent functions shows, as a constant or coefficient, the approximate number of years it took for the literacy rate to triple?

(a) L(t)=5.3 x 3^t/44.5

(b) L(t)=5.3 x 1.077^t/3

(c) L(t)=5.3 x 1.008^3t

(d) L(t)=3 x 1.025^t+23

Thanks so much. I know what the answer is, but I just have no idea why it is the answer. I just want to understand :(