Anonymous
Anonymous asked in Science & MathematicsMathematics · 9 years ago

please help me with my maths homework?

please help with percentagesss <3

willam collected $45 for charity which accounted for 17% of the total amount collected determine how much was collected....

taylor and madekeine collected %655 for charity. if this was 14% of the total collected how much was collected all together

a plumber jack, charged jarred $503 for his outstanding work.if this price did not included GST determine the final bill

jay sold a painting to jai for 2750 and made 42% profit. what was the original cost of the painting <3

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  • 9 years ago
    Favorite Answer

    Proportions

    When dealing with proportions, you're asking what percentage is this value worth or what value is this perentage worth.

    45/17 x/100 ($45 is 17% of the 100% which is x)

    cross multiply

    4500 = 17x

    Divide

    x = $264.71

    655/14 x/100

    65,500 = 14x

    x = $4678.57

    For this one, I can't really help you. The teacher or book should supply you with a value for GST, so what you do is you take that percentage, (we'll call it p) and do this

    503/p x/100

    50,300 = px

    50,300/p = x

    but you're not done

    once you have x, you have to add it to the $503 for the total bill (t for total)

    t = 503 + x

    This one is a little different too

    Profit is the difference between purchase price (2750) and cost (original)

    If he makes 42% profit, 2750 is the 42% + the 100% original cost

    2750/142 x/100

    275,000 = 142x

    x = $1936.62

    Hope it helps, sorry about number 3 : /

  • Anonymous
    9 years ago

    45 is 17% of the whole amount (defined as x)

    Formula is:

    0.17x = 45

    x = 45/0.17

    x = 264.71

    655 is 14% of the whole amount (defined as x)

    Formula is:

    0.14x = 655

    x = 655/0.14

    x = 4678.57

    503 is the amount before the GST, GST is currently 5% (see source below), the final bill is defined as x

    Formula is:

    x = 503 + (503*0.05)

    x = 503 + 25.15

    x = 528.15

    2750 is the total amount of the painting, the original cost is unknown (defined as x). The painting sold for 142% of its original value.

    Formula is:

    1.42x = 2750

    x = 2750/1.42

    x = 1936.62

  • 9 years ago

    it costs $2530 through ratio and proportions method !

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