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# By what percent did the number of blue whales spotted at loc

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By what percent did the number of blue whales spotted at loc [#permalink]  22 Jun 2018, 10:28
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Attachment:

humpback2.jpg [ 36.9 KiB | Viewed 1000 times ]

By what percent did the number of blue whales spotted at location X decrease between 1999 and 2003?

A. 20%

B. 30%

C. 40%

D. 70%

E. 80%
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Re: By what percent did the number of blue whales spotted at loc [#permalink]  23 Jun 2018, 05:50
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Carcass wrote:

By what percent did the number of blue whales spotted at location X decrease between 1999 and 2003?

Here,

this is percentage change
so we can look into the last attachment for blue whales

From the graph we can see that the number of blue whales seen in the year 1999 = 500

and the number of blue whale seen in 2003 = 400

Therefore the percentage change = $$\frac{(400 - 500)}{400}$$ $$* 100%$$

i.e. -20% i.e. 20 percent decrease
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Re: By what percent did the number of blue whales spotted at loc [#permalink]  19 Oct 2020, 12:41
pranab223 wrote:
Carcass wrote:

By what percent did the number of blue whales spotted at location X decrease between 1999 and 2003?

Here,

this is percentage change
so we can look into the last attachment for blue whales

From the graph we can see that the number of blue whales seen in the year 1999 = 500

and the number of blue whale seen in 2003 = 400

Therefore the percentage change = $$\frac{(400 - 500)}{400}$$ $$* 100%$$

i.e. -20% i.e. 20 percent decrease

It should be 100/500 * 100%. Your response yields -25%.
Re: By what percent did the number of blue whales spotted at loc   [#permalink] 19 Oct 2020, 12:41
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