# SOLUTION: Bob invested some money at 5% simple interest and some at 9% simple interest. The amount invested at the higher rate was twice the amount invested at the lower rate. If the total

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 Question 190385This question is from textbook algebra for college students : Bob invested some money at 5% simple interest and some at 9% simple interest. The amount invested at the higher rate was twice the amount invested at the lower rate. If the total interst on the investments for 1 year was \$920, then how much did he invest at each rate? I know what the answer is but I have tried every forumla and can't figure out where the numbers come from. The anser is \$4000 @ 5% and \$8000 @ 9%. Your help is greatly appreciated!This question is from textbook algebra for college students Answer by jojo14344(1512)   (Show Source): You can put this solution on YOUR website! Done. Same as Problem# 190386 Thank you