Question 1110852
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Hi   
 Let x represent amount invested at 10%    
Principal•rate = Interest
.10x + .09($20,000-x) = $1840
 .01x = $1840 - $1800
 .01x = $40
x = $4000, amount at 10%, $16,000 at 9%  {{{20000-4000 = 16000}}}
CHECKING our answer***
.10•$4000 + .09•$16000= $400 + $1440 = $1840