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Scorpion4ik [409]
3 years ago
12

If the original number is 15 and the new number is 5, what is the percent decrease?

Mathematics
1 answer:
Arlecino [84]3 years ago
6 0
When a quantity grows (gets bigger), then we can compute its PERCENT INCREASE:

[beautiful math coming... please be patient] <span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span></span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span></span></span>

Some people write this formula with <span><span>100%</span><span>100%</span></span> at the end,
to emphasize that since it is percent increase, it should be reported as a percent.

So, here's an alternate way to give the formula:

<span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span>⋅100%</span><span>PERCENT INCREASE=<span><span>(new amount−original amount)</span>original amount</span>⋅100%</span></span>

Recall that <span><span>100%=100⋅<span>1100</span>=1</span><span>100%=100⋅<span>1100</span>=1</span></span> .
So, <span><span>100%</span><span>100%</span></span> is just the number <span>11</span> !
Multiplying by <span>11</span> doesn't change anything except the name of the number!
Hope this helps

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