How long will it take a certain sum of money to triple itself

How long will it take a certain sum of money to triple itself at 13% per annum simple interest?

Solution:

At a certain rate of simple interest ₹4050 amounts to ₹4576·50 in 2 years. At the same rate of simple interest, how much would ₹1 lakh amount to in 3 years?

Solution:

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