Question 1161441
<br>
let x = amount invested at 9%
then 3x+31000 = amount invested at 10%<br>
interest from investment at 9% = .09(x)
interest from investment at 10% = .10(3x+31000)<br>
The total interest was 24940:<br>
{{{.09x+.10(3x+31000) = 24940}}}<br>
Solve using basic algebra....<br>