8th grade maths

The dimensions of rectangle is 40*25if the breadth and length are increased by 15% what is their new area in percentage

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  1. new length = 1.15(40) = 46
    new width = 1.15(25) =28.75

    new area = 28.75(46) = 1322.5
    old area = 1000
    new area as a percent of old area
    = 1322.5/1000 = 132.25%

    or

    areas of similar shapes are proportional to the square of their sides
    --- 1.15^2 = 1.3225 = 132.25%

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