Question 1162038
<br>
If she has three times as much invested at 9% as at 5%, then the average rate is 8%:<br>
{{{(3(9)+1(5))/4 = (27+5)/4 = 8}}}<br>
Since the average interest rate was 8% and the interest was $960, the amount invested was $960/.08 = $12,000.<br>
Then again since she had three times as much invested at 9% as at 5%, since the total was $12,000 the two amounts were $9000 at 9% and $3000 at 5%.<br>