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Math Help - percentage increase

  1. #1
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    percentage increase

    can someone please help me... i've got a silly question to ask..

    i'm trying to calculate the percentage increase between 15000 and 16000; the answer i get is 6.25%, but when i try and increase 15000 by 6.25% I get 15937.5 ??? where am i going wrong?? furthermore if i try and decrease 16000 by 6.25% i get 1000 viz 15000!!??!

    can someone please explain why a 6.25% increase on 15000 isnt 16000 and if it isnt what is the correct percentage increase??

    sorry if i sound thick.. its been a long day.

    thanks
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by technics View Post
    can someone please help me... i've got a silly question to ask..

    i'm trying to calculate the percentage increase between 15000 and 16000; the answer i get is 6.25%, but when i try and increase 15000 by 6.25% I get 15937.5 ??? where am i going wrong?? furthermore if i try and decrease 16000 by 6.25% i get 1000 viz 15000!!??!

    can someone please explain why a 6.25% increase on 15000 isnt 16000 and if it isnt what is the correct percentage increase??

    sorry if i sound thick.. its been a long day.

    thanks
     \frac{16000 - 15000}{15 000} = 6,6666667 \ percent
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  3. #3
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    Quote Originally Posted by technics View Post
    can someone please help me... i've got a silly question to ask..

    i'm trying to calculate the percentage increase between 15000 and 16000; the answer i get is 6.25%, but when i try and increase 15000 by 6.25% I get 15937.5 ??? where am i going wrong?? furthermore if i try and decrease 16000 by 6.25% i get 1000 viz 15000!!??!

    can someone please explain why a 6.25% increase on 15000 isnt 16000 and if it isnt what is the correct percentage increase??

    sorry if i sound thick.. its been a long day.

    thanks
    \frac{16000-15000}{15000}=\frac{1000}{15000}=\frac1{15}=0.0\ov  erline6

    This is an increase of about 6.67\%\text.
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  4. #4
    A riddle wrapped in an enigma
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    Quote Originally Posted by technics View Post
    can someone please help me... i've got a silly question to ask..

    i'm trying to calculate the percentage increase between 15000 and 16000; the answer i get is 6.25%, but when i try and increase 15000 by 6.25% I get 15937.5 ??? where am i going wrong?? furthermore if i try and decrease 16000 by 6.25% i get 1000 viz 15000!!??!

    can someone please explain why a 6.25% increase on 15000 isnt 16000 and if it isnt what is the correct percentage increase??

    sorry if i sound thick.. its been a long day.

    thanks
    Hi technics,

    To calculate the percentage of increase from 15,000 to 16,000, first subtract to find the amount of increase.

    16000 - 15000 = 1000

    Next, make that amout a fraction of the original amount and convert to a percent:

    \frac{1000}{15000}=\frac{1}{15}=6\frac{2}{3}%.

    Check:

    15000+\frac{1}{15}(15000)=16000

    Edit: I'm a bit slow today, but I'll leave my explanation.
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  5. #5
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    Thanks guys, i've got it basically the percentage increase between 15000 and 16000 is 6.67~

    I understand where i was going wrong now as well, i was basically dividing it by 16000 afterwards instead of 15000 which was the original!! how stupid of me :P
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