Question

In what time a sum of money will triple itself s.I 20% per annum

Answer 1

consider principle as 100
simple amount as 300
then you get si as 200
rate of interest is 20%
then find n by simple si formula
$si = \frac{pnr}{100}$
you get n as 10 years
method 2
this is shortcut method
for si triple itself sum simply use nr =200
by this you get (20×n = 200)
hint * for double itself use nr=100
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