Question 326710
account paying 7% let the amount invested be x 
twice that amount account paying 9% = 2x
interest after one year,= $500. 
..
0.07x +0.09*2x=500
0.07x+0.18x=500
0.25x=500
divide by 0.25
0.25x/0.25 = 500/0.25
x= 500/0.25
=$ 2000 at 7%
2x = 2*2000 = $4000 at9%