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Math Help - How do I calculate this?

  1. #1
    BKK
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    How do I calculate this?

    Billy sold 100 apples in January, sales went up by 10% in the second week, 20% in the third week, and went down by 50% in the fourth and final week.

    How do I calculate how many apples were sold in the first week?
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  2. #2
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    Billy sold 100 apples in January, sales went up by 10% in the second week, 20% in the third week, and went down by 50% in the fourth and final week.

    Just a thought I'm not 100% on this

    100 apples = total sold
    x+(x*1.1)+(x*1.2)+(x*.5)=100

    Then rearrange and solve for x.

    Unless, the growth is based off of the # sold in each week (i.e. sold 20 apples in week 1 then 22 in week 2 and then 26 and then 13 the last week...) So assuming that X is based off the first weeks sales, I think this should work
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  3. #3
    BKK
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    Thank you for your help.

    Unless, the growth is based off of the # sold in each week (i.e. sold 20 apples in week 1 then 22 in week 2 and then 26 and then 13 the last week...)
    Yes, the growth is based off of the number sold in each week.
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