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Sajjad1994
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JohnWidestone SajjadAhmad Bunuel ...Need help,

can you please tell me why did you use 1 - 70/140 ?

i tried using x/100 * 145 = 70....can you please tell me what did i do wrong?

Hello dear,

Annual Low in 2000 = 60
Annual Low in 2001 = 80

The Average Low of 2000 to 2001 \(= \frac{60+80}{2}= 70\)

Annual High in 2003 = 190
Annual High in 2004 = 100

The Average High of 2003 to 2004 \(= \frac{190+100}{2}=145\)

\(1-\frac{70}{145} =\) 52% Approx.

Answer: D

Take a look at screenshot also.

Attachment:
123.jpg
123.jpg [ 128.68 KiB | Viewed 2710 times ]
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SajjadAhmad
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JohnWidestone SajjadAhmad Bunuel ...Need help,

can you please tell me why did you use 1 - 70/140 ?

i tried using x/100 * 145 = 70....can you please tell me what did i do wrong?

Hello dear,

Annual Low in 2000 = 60
Annual Low in 2001 = 80

The Average Low of 2000 to 2001 \(= \frac{60+80}{2}= 70\)

Annual High in 2003 = 190
Annual High in 2004 = 100

The Average High of 2003 to 2004 \(= \frac{190+100}{2}=145\)

\(1-\frac{70}{145} =\) 52% Approx.

Answer: D

Take a look at screenshot also.

Attachment:
123.jpg

Thanks, @SajjadAhmad...I just don't understand the last bit

1-70/145...why is the percentage formula not used here ?

X/100*145= 70??

Posted from my mobile device
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Why do we have to take subtract from 1 in the last step?
Please explain.
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tittoo
Why do we have to take subtract from 1 in the last step?
Please explain.


It is essentially the same thing, 1-70/145=75/145 which is the same as the % change formula we normally use.
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I did 70/145 * 100%
I don't understand the step for subtracting that answer from 1.
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