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Math Help - urgent help... I'm horrible with percentage

  1. #1
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    urgent help... I'm horrible with percentage

    1. The population of Sherbrook increased from 18,000 to 19,530. What was the percent increase

    2. Find the percent notation for 5/16

    3. Translate to an equation. Then solve. What is 20% of 80?

    4. If 52% of the employees at a company are female and the company employs 4200 workers, how many employees are female?
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  2. #2
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    Here's how to think of percentages. If you got 9 out of 10 in a math test, what was your percentage grade?

    Obviously it would be 9/10 which is 90%

    Now what if the teacher decided to give you extra-credit, and you got an extra point on the test (you now have 10 out of 10) by how much does the percent grade increase?
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  3. #3
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    Thanks for the response but I still can't figure out these problems the decimal points the formulas throw me off
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  4. #4
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    Thanks for the response but I still can't figure out these problems the decimal points the formulas throw me off
    You got 9/10 right on a test, in percents that 90%.

    However, if you just divide you'll find that: \frac{9}{10}=0.9

    You got extra-credit, so you now have 10/10, obviously that's a 100%.

    And: \frac{10}{10}=1

    Notice the connection? The decimal form of a percent is the percent divided by 100.

    Now let's say you got 93% on a 100 question test. Well you turn 93% into decimal form, which gives you 0.93

    Now you multiply 100 by 0.93 to get 93. So you got 93 questions correct
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  5. #5
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    i understand that and thank you... but with percent notation things tend to change up a little. for example..

    How do I find the percent notation for 5/16

    18000 to 19530 what is the percent increase... i do not understand how to find these answers
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  6. #6
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    i understand that and thank you... but with percent notation things tend to change up a little. for example..

    How do I find the percent notation for 5/16

    18000 to 19530 what is the percent increase... i do not understand how to find these answers
    \frac{5}{16}=0.3125=31.25\%
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  7. #7
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    a few remarks about percentages

    Hello,

    you wrote: "urgent help... I'm horrible with percentage"

    There is nothing to be horrified about:

    Percentage calculation is nothing else but to compare one part of a value to the whole value. By this method you can compare measurable or countable values to an abstract scale from 0 to 100. This scale contains / exists of the mysterious percents. (See attachment)

    You've got 4 numbers:
    1.Basic value : BV
    2.Part Value : PV
    3.Percentage : p
    4.100

    the basic equation to calculate percentages is:

    \frac{PV}{BV}=\frac{p}{100}

    This equation can be solved for p:

    p=\frac{PV}{BV}\cdot 100. The result must get a %-sign.

    PV=\frac{p}{100}\cdot BV. The result must get the same unit as BV.

    BV=\frac{PV}{p}\cdot 100. The result must get the same unit as PV.

    Use the mnemonic which I've added at the right side of the attachment: Cover the variable which you want to calculate. What you can see is (nearly) the formula to calculate it.

    EB
    Attached Thumbnails Attached Thumbnails urgent help... I'm horrible with percentage-expl_percent.gif  
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  8. #8
    Senior Member OReilly's Avatar
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    1. The population of Sherbrook increased from 18,000 to 19,530. What was the percent increase
    Earboth has explained you how to calculate percentage with equation.

    Let just me give you example for your first question by applying that equation:

    Increase of population is 19530-18000 =1530.
    So you have to compare 1530 to 18000.

    Use percentage equation:
    \begin{array}{l}<br />
 BV = 18000 \\ <br />
 PV = 1530 \\ <br />
 p = ? \\ <br />
 \end{array}<br />

    p = \frac{{PV}}{{BV}} \cdot 100
    p = \frac{{1530}}{{18000}} \cdot 100
    p = 0.085 \cdot 100
    p = 8.5\%

    Try to solve other questions similar.
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