Question 1111503
Find number of years									
Principal P =	2000								
Amount=	4000								
years=n									
compounded (t)	12  (monthly)								
Rate =	5		(5%/12)	->	0.004166667				
Amount =	P*((n+r)/n)^n*t								
									
4000	=	2000	*(	1	+	0.004166667	)^	n*t	
2	=	*(	1	+	0.004166667	)^	n*	12	
ln	2	=	12	n *ln	1.004166667				
	0.693147181	=	12	0.00415801	*n				
	13.89180473	=	n

Number of years = 13.89