Question 490508
Investment I	10.00%		per annum	---x					
Investment II	30.00%		per annum	---y					
									
x		+	y=	10000	------------------------1				
10.00%	x	+	30.00%	y	=	$860.00			
Multiply by 		100							
10	x		-30	y	=	0		--------2	
									
Multiply (1) by			-10						
we get									
									
-10	x	-10	y	=		-100000.00			
									
Add this to (2)									
									
0	x	-40	y	=		-100000			
									
divide by		-40							
									
y	=		2500		investment at 	30.00%
Balance			7500 		investment at 	10.00%