If the simple interest for 6 years be equal to 30% of the

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If the simple interest for 6 years be equal to 30% of the principal, it will be equal to the principal after

Let the principal be P and rate of interest be r %
According to the question,

30P	=	P × 6 × R
100	=	100

⇒ 30 = 6 R
⇒ R = 5
Now, let interest be equal to principal in T years.

∴ P =	P × T × 5
	100

⇒ T =	100	= 20 Years.
	5

Second method to solve this question :

Here , n =	30	=	3	, T = 6 Years.
	100		10

⇒ RT = n × 100

R × 6 =	3	× 100
	10

R = 5%
As, S.I. = P

⇒ SI =	P × T × R
	100

100 = RT
100 = 5 × T
This is possible only when T = 20.