at a certain middle school, the 6th-grade class of 390 increased by 10%, the 7th grade class of 350 increased by 22%, and the 8th grade clas

Question

at a certain middle school, the 6th-grade class of 390 increased by 10%, the 7th grade class of 350 increased by 22%, and the 8th grade class of 420 increased by 20%. Overall, what was the percentage increase of students for this middle school? Express your answer to the nearest tenth.

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    2021-09-09T01:54:09+00:00

    The overall percentage of increase of students for this middle school is about 17.2%

    To do this you have to know the number of students in each grade and add them together and do this:

    390 x 0.1 = 39 Students

    350 x 0.22 = 77 students

    420 x 0.2 = 84 students

    Add all the number of students and do this:

    (200 students over 1,160) x 100%

    (Increased students over original students) x 100%

    0.172 x 100% = 17.2%

    The percentage increase of the students of the middle school is about 17.2%

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