Question 1207173
Try tabulating the information and form your needed equations.
<pre>
PART AT RATE         AMOUNT          INTEREST IN YEAR
       8%             x               0.08x         
       11%            y              0.11y
       14%           x+y+900         0.14(x+y+900)                
TOTAL                6900                   834
</pre>

{{{system(2x+2y+900=6900,0.08x+0.11y+0.14x+0.14y+(0.14)(900)=834)}}}


{{{system(x+y=3000,0.22x+0.25y=834-(0.14)(900))}}}


{{{system(x+y=3000,0.22x+0.25y=708)}}}


{{{0.22(3000-y)+0.25y=708}}}


{{{660-0.22y+0.25y=708}}}


{{{0.03y=708-660}}}


{{{highlight(y=1600)}}}--------for 11% rate


{{{3000-1600=highlight(x=1400)}}}-------for 8% rate


{{{highlight(3900)}}}----------for 14% rate