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Mathematics 8 Online
OpenStudy (anonymous):

Which best describes the percent change from 60 to 30?

jimthompson5910 (jim_thompson5910):

Hint: Percent Change = [(New - Old)/(Old)] * 100

OpenStudy (anonymous):

that doesn't work

jimthompson5910 (jim_thompson5910):

What is the "New" value?

OpenStudy (anonymous):

30

jimthompson5910 (jim_thompson5910):

What is the "old" value?

OpenStudy (anonymous):

60

jimthompson5910 (jim_thompson5910):

So Percent Change = [(New - Old)/(Old)] * 100 becomes Percent Change = [(30-60)/(60)] * 100

jimthompson5910 (jim_thompson5910):

Tell me what you get when you compute that

OpenStudy (anonymous):

so are saying times 60 and hundred

jimthompson5910 (jim_thompson5910):

focus on (30-60)/(60) first

jimthompson5910 (jim_thompson5910):

compute (30-60)/(60), then multiply this result by 100

OpenStudy (anonymous):

wrong none of the answers match that

jimthompson5910 (jim_thompson5910):

What did you get?

OpenStudy (anonymous):

600

jimthompson5910 (jim_thompson5910):

Well that's why

jimthompson5910 (jim_thompson5910):

(30-60)/(60) times 100 is not 600

OpenStudy (anonymous):

i meant 6000

jimthompson5910 (jim_thompson5910):

Can you tell me what (30-60)/(60) is?

jimthompson5910 (jim_thompson5910):

it's not 6000 either

OpenStudy (anonymous):

then what is it

jimthompson5910 (jim_thompson5910):

30 - 60 is???

OpenStudy (anonymous):

30

jimthompson5910 (jim_thompson5910):

more like -30 so (30-60)/(60) becomes (-30)/(60)

jimthompson5910 (jim_thompson5910):

Now divide -30 into 60 to get???

OpenStudy (anonymous):

-o.5

jimthompson5910 (jim_thompson5910):

good, then multiply by 100 to get the percentage

OpenStudy (anonymous):

-50

jimthompson5910 (jim_thompson5910):

good

jimthompson5910 (jim_thompson5910):

so this basically means that you've had a 50% decrease when you go from 60 to 30

jimthompson5910 (jim_thompson5910):

or put another way, you've taken half of 60 (which is 30) from 60 to get 60-30 = 30

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