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MATH

Suppose 10,000 is invested at 6 percent.how much additional money must be invested at 8 percent to produce a yield on the entire amount invested of 7.2 percent. ( Please show each and every steps of this math with the rough works) THANK YOU SO MUCH.

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  1. add up the interest on each part. It must equal the total interest.

    .06(10000) + .08x = .072(10000+x)
    x = 15,000

    Note that 7.2% is 3/5 of the way from 6% to 8%, and 15000 is 3/5 of the total 25000.

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  2. thank you Steve u r genious :)

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  3. AND, I can spell GENIUS!

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