Answer: See explanation
Step-by-step explanation:
Based on the scenario in the question, our calculation goes thus:
0.11x + 0.06(8000 - x) = 500
0.11x + 480 - 0.06x = 500
0.11x - 0.06x = 500 - 480
0.05x = 20
x = 20/0.05
x = 400
$400 was invested at 11%
Also, 8000 - 400 = 7600 invested at 6%