SOLUTION: A sum of money invested at an annual interest rate of 9% earns $1080 interest for the year. Twice this sum is invested at a yearly rate 9 1/2 earns $2280 for the year. How much i
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Question 796911: A sum of money invested at an annual interest rate of 9% earns $1080 interest for the year. Twice this sum is invested at a yearly rate 9 1/2 earns $2280 for the year. How much is invested at each rate? Answer by rfer(16322) (Show Source):
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