please help me with my maths homework?

Question

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

Answer 1

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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 : /

Answer 2

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

Source(s): For GST rate "http://en.wikipedia.org/wiki/Sales_taxes_in_Canada...

Answer 3

it costs $2530 through ratio and proportions method !