SOLUTION: Mr. Turner invested a sum of money at 7% and twice that sum at 3%. His yearly return was \$390. How much did Mr. Turner invest at each rate? (This problem is not from a textbook).

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 Question 38951: Mr. Turner invested a sum of money at 7% and twice that sum at 3%. His yearly return was \$390. How much did Mr. Turner invest at each rate? (This problem is not from a textbook). Please help, Thank YouAnswer by fractalier(2101)   (Show Source): You can put this solution on YOUR website!Let x be what he invested at 7%. Thus 2x is what was invested at 3%. So we have (.07)x + (.03)(2x) = 390 multiply by 100 to clear decimals 7x + 6x = 39000 13x = 39000 x = \$3000 at 7% 2x = \$6000 at 3%