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29 May, 02:00

Carlos invested part of $3,000 in a 10% certificate account and the rest in a 6% passbook account. The total annual interest from both accounts is $270. How much did he invest at 6%?

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  1. 29 May, 05:53
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    (3000-n) * (10/100) + n * (6/100) = 270

    300 - 0.1n + 0.06n = 270

    300 - (0.1n - 0.6n) = 270

    300 - 0.04n = 270

    -0.04n = - 30

    n = - 30/-0.04 = 750

    Investment at 6% = 750

    Investment at 10% = 3000 - 750 = 2250

    And to check just plug it back in so,

    (0.06*750) + (0.1*2250) = 270
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