Last year, Manuel had $10,000 to invest. He invested some of it in an account that paid 7% simple in | MathCelebrity Forum

Last year, Manuel had $10,000 to invest. He invested some of it in an account that paid 7% simple in

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Last year, Manuel had $10,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and he invested the rest in an account that paid 10% simple interest per year. After one year, he received a total of $730 in interest. How much did he invest in each account?

The answer is $9,000 and $1,000 found on this calculator.
 
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