SOLUTION: Randy Invested twice as much at 10% as he did at 8%. If he earned $30.80 annually, how much did he invest at each rate?

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Question 677182: Randy Invested twice as much at 10% as he did at 8%. If he earned $30.80 annually, how much did he invest at each rate?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = amount invest @ 8%
+2x+ = amount invested @ 10%
given:
+.08x+%2B+.1%2A%282x%29+=+30.8+
+.08s+%2B+.2x+=+30.8+
+.28x+=+30.8+
+x+=+110+
+2x+=+220+
Randy invested $110 @8% and $220 @10%