Question 694590
7.5% ------------->x
5.5%---------------->2x

Balance amount = (10000-(x+2x))

(10000-(x+2x))-----------> 4%


Sm up individual interests

7%x+5.5%*2x+(10000-(x+2x))*4%=49000

multiply equation by 100

7x+11x+40000-12x=49000

6x=9000
x= 9000/6
x= 1500 amount invested at 7%
2x= 3000  amount at 5%
Balance 5500  at 4%

CHECK

1500	7.00%	105
3000	5.50%	165
5500	4.00%	220
		490