Question 1188420
<br>
Bad data, requiring answers that are not whole numbers of dollars, and not even whole numbers of cents....<br>
x = amount invested at 12%
40000-x = amount invested at 15%<br>
The total interest was 5800:<br>
{{{.12(x)+.15(40000-x)=5800}}}<br>
You can do the algebra to try to find the answer.<hr>
Here is a quick informal way to find the answer.<br>
All $40,000 invested at 12% would yield $4800 interest; all at 15% would yield $6000.
Look at the three numbers 4800, 5800, and 6000 on a number line and observe/calculate that 5800 is 1000/1200 = 5/6 of the way from 4800 to 6000.
That means 5/6 of the total was invested at the higher rate.<br>
5/6 of $40,000 is not a whole number....<br>