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23 October, 01:27

sam received $1120 interest from his 4 year investment at 3.5% p. a. simple interest. how much did sam invest?.

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  1. 23 October, 04:33
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    Total is 1120

    interest is 3.5

    interest earn in 1 yr be p

    so is p / 100 * 3.5 * 4 = 1120

    1120:4 = p/100x 3.5

    280=p/100 x 3.5

    280:3.5 = p/100

    80=p/100

    p = 8000
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