SOLUTION: sarah invested $1200 in the bank part at 9% per annum and the remainder at 4% per annum. after one year the 9% investment had $56 more interest. how much was invested at each rate?

Question 615000: sarah invested $1200 in the bank part at 9% per annum and the remainder at 4% per annum. after one year the 9% investment had $56 more interest. how much was invested at each rate?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
sarah invested $1200 in the bank part at 9% per annum and the remainder at 4% per annum. after one year the 9% investment had $56 more interest. how much was invested at each rate?
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0.09x - 0.04(1200-x) = 56
9x - 4*1200 +4x = 5600
13x = 5600+4800
13x = 10400
x = $800 (amt. invested at 9%)
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1200 -x = 400 (amt. invested at 4%)
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Cheers,
Stan H.
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