algebra

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Calvin invested $7500 for one year, part 12% annual interest and the rest at 10% annual interest. His total interest for the year was $890. How much money did he invest at 12%?

  • algebra -

    part at 12% ---- x
    part at 10% ---- 7500-x

    solve for x ....

    .12x + .10(7500-x) = 890

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