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    seboo's Avatar
    seboo Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 12, 2009, 09:53 PM
    Percentage calculation
    Can anyone help me solve the following problem? Please include the formula:


    A computer is on sale for $1600, which is a 20% discount off the regular price. What is the regular price?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Nov 12, 2009, 10:31 PM

    It's all based on this:

    X% of Y is Z

    There are two ratios here: X% is X/100

    The number after of is the denominator Z/Y

    Thus X(%)/100 = (is)Z / (of)Y

    Fill in the blanks. What do you get?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Nov 13, 2009, 03:48 AM

    I do it by simple proportion.

    100% is the regular price.
    20% off is the discount
    So, 80% is the sales price.

    80% makes up $1600
    1 % therefore makes up 1600/80 = $20
    So, how much does 100% make up?
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
    Junior Member
    		  
    #4

    Nov 28, 2009, 06:45 AM

    sale price=(1-%)first price
    1600=(1-0.2)p
    1600=0.8p
    divide by 0.8 or multiply by 1.25
    2000=2000
    very simple
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