Ratio of the principal and the amount after 1 year is 10

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Ratio of the principal and the amount after 1 year is 10 : 12. Then the rate of interest per annum is :

As per the given in question ,

Principal	=	10
Amount	=	12

Amount	=	Principal + interest	=	12
Principal	=	Principal	=	10

⇒ 1 +	Interest	=	12
	Principal		10

⇒	Interest	=	2	=	1
	Principal		10		5

∴ Rate =	1	× 100 = 20%
	5