Question 279618
Investor Company loaned out a total of $36,000, part at 6% interest and part at 9% interest. They reported that the annual earnings from both investments were the same amount that would have been earned by the total loan if it had been 

let x be invested at 6%

36000-x will be invested  at 9%

0.06x=0.09(36000-x) ( the interests on both are the same.)

0.06x= 3240. 00- 0.09x

0.15x= 3240

x=$21600  at 6 %

$36000-$21600= $24400 at 9%