# SOLUTION: Melissa invested a sum of money at 3% annual interest. She invested three times that sum at 5% annual interest. If her total yearly interest from both investments was 5400, how muc

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 Question 633377: Melissa invested a sum of money at 3% annual interest. She invested three times that sum at 5% annual interest. If her total yearly interest from both investments was 5400, how much was invested at 3%Answer by John10(245)   (Show Source): You can put this solution on YOUR website!Melissa invested a sum of money at 3% annual interest. She invested three times that sum at 5% annual interest. If her total yearly interest from both investments was 5400, how much was invested at 3% ? _________________________________________ Hello, we need to find the sum of money which invest at 3% interest. So we will assume that amount is x. Thus the amount of money invest into 5% is 3x. We know that the sum of interest from both account (3% and 5%) is 5400. We will have an equation: 0.03x + 0.05(3x) = 5400 0.03x + 0.15x = 5400 0.18x = 5400 x = 5400/0.18 x = 30,000 Thus the sum of money invest in 3% is \$30,000. Hope it helps:) John10