SOLUTION: john invested 4000 for a year, part at 7% per annum and part at 9% per annum. the interest on the investment is 300. how much did john invest at each rate

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: john invested 4000 for a year, part at 7% per annum and part at 9% per annum. the interest on the investment is 300. how much did john invest at each rate      Log On


   

Question 1163145: john invested 4000 for a year, part at 7% per annum and part at 9% per annum. the interest on the investment is 300. how much did john invest at each rate
Answer by Alan3354(69443) About Me  (Show Source):
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john invested 4000 for a year, part at 7% per annum and part at 9% per annum. the interest on the investment is 300. how much did john invest at each rate
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A = amount at 7%
A*0.07 + (4000 - A)*0.09 = 300