Question 816750
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Hi,
Investing $12,000, some at 4% and some at 4.5%
0.04x +0.045(12000-x)= $525
 0.04x + 540 -.045x = 525 
    540-525 = .005x
      15/.005 = x = $3000 at 4%  and $9000 at 4.5%
CHECKING our answer***
 {{{.04*3000 + .045*9000 }}} = $120 + $405 = $525