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Steve invested $6000, part at 7% and the rest at 14%. If the amount of interest
earned at 7% was 2 times the amount of interest earned at 14%, how much did Steve invest at each rate?
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Looking in the input numbers, I can solve it MENTALLY:
$4800 at 7%, and
$1200 at 14%.
Check. 0.07*4800 = 336; 0.14*1200 = 168; = 2. Correct !