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Q.
In how many years will a sum of money triple itself at $25 \%$ per year simple interest?
Simple Interest and Compound Interest
Solution:
Let sum be Rs. $x$ and amount be Rs. $3 x$
Simple interest $=$ Rs. $(3 x-x)=$ Rs. $2 x$
Let the time be ' $\mathrm{T}$ ' years
Then, $\mathrm{T}=\frac{100 \times \mathrm{S} . \mathrm{T} .}{\mathrm{P} \times \mathrm{R}}=\frac{100 \times 2 x}{x \times 25}=8$ years