Question 839291
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Hi,
Let x and y represent amount saved at 10% and 12% respectively
    x  + y = $8,000    0r  {{{x = 8000 - y }}}
 .10x + .12y = $900
 .10(8,000 - y) + .12y = 900  |solving the system of EQs by substitution
             .02y = 900 - 800
              .02y = 100
                 y = $5000  and x = $3000
CHECKING our answer***
{{{.10*3000 + .12*5000 = 300 + 600}}} = $900
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