# 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 \$540, how muc

Algebra ->  Algebra  -> Expressions-with-variables -> 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 \$540, how muc      Log On

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 Question 265129: 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 \$540, how much was invested at 3%?Answer by checkley77(12569)   (Show Source): You can put this solution on YOUR website!.03X+.05*3X=540 .03X+.15X=540 .18X=540 X=540/.18X X=3,000 AMOUNT INVESTED @ 3%. 3*3,000=9,000 AMOUNT INVESTED @ 5%. PROOF: .03*3,000+.05*9,000=540 90+450=540 540=540