Results 1 to 4 of 4

Math Help - B is 25% more than A. C is 20% more than B.

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    15

    Post B is 25% more than A. C is 20% more than B.

    B is 25% more than A. C is 20% more than B. How many percent more is C than A?



    I am not very sure of the answer, whether it is 45% or 50%. Can someone please help? thanks
    Last edited by mr fantastic; June 7th 2010 at 05:52 AM. Reason: Re-titled.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie darknight's Avatar
    Joined
    Sep 2009
    From
    on the dark side of the moon
    Posts
    16
    50%
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jan 2009
    Posts
    591
    Quote Originally Posted by dtay View Post
    B is 25% more than A. C is 20% more than B. How many percent more is C than A?
    I am not very sure of the answer, whether it is 45% or 50%. Can someone please help? thanks
    B = A + A(25/100)
    B = A(1+0.25)
    B = 1.25A

    C = B + B(20/100)
    C = 1.2B

    C = 1.2(1.25A)
    C = 1.2 x 1.25 A
    C = 1.5 A

    C = A + (50/100)

    50%
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Dec 2007
    From
    Ottawa, Canada
    Posts
    3,161
    Thanks
    70
    Or simply 100(1.25)(1.20) = 150
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum