At what per cent per annum will a sum double itself in $8$ years?

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Solution

Let Principal=p
Then,
$S . I = p$ and Time $= 8$ years
Rate $= (100 \times p) / (p \times 8)$ %
$= 12.5$ % per month
Then,
We get $12.5$ % per month.

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At what per cent per annum will a sum double itself in 8 years?

Let Principal=pThen,S.I=p and Time=8yearsRate=(100×p)/(p×8)%=12.5% per monthThen,We get 12.5% per month.

At what per cent per annum will a sum double itself in $8$ years?

Let Principal=p
Then,
$S . I = p$ and Time $= 8$ years
Rate $= (100 \times p) / (p \times 8)$ %
$= 12.5$ % per month
Then,
We get $12.5$ % per month.