RRB Group D 10-Oct-2018 Shift 2 Solved Paper

Question : 66 of 100

Marks: +1, -0

At what rate of simple interest per annum will a sum triple itself in 8 years?

Solution:

Principal

={P}

\∴

Amount

=3 {P}

⇒{SI}=3 {P}-{P}=2 {P}

From the question,

2 {P}={P × r \× 8}/{100}

{r}={2 \× 100}/{8}⇒{r}=25 \%

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