Mathematics
8 Online
OpenStudy (anonymous):
Which best describes the percent change from 60 to 30?
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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?
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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
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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
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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
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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
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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