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Comment on Working with Percent
I like the idea that one
"In group 1, there are 300
allergic wheezing and (0.02)(300) people, or 6 people, have nonallergic wheezing.
Therefore, in group 1, the number of people who have allergic wheezing exceeds the number who have nonallergic wheezing by 9, which is \frac{9}{6}=1.5*100%
The answer is C
I got 250% (not even an answer choice) because I did 15/6 *100 rather than 9/6 * 100. How do you know to do 15/6?
You're referring to the
You're referring to the question here: http://greprepclub.com/forum/the-number-of-people-in-group-1-who-have-th...
You're mixing up the fact that 15 is equal to 2.5 TIMES 6 with the concept of "greater than".
For example, we can say that 12 is 200% of 6, since 12 = 200% of 6 = 2.00 x 6
However, we can't say that 12 is 200% GREATER THAN 6
To find 200% GREATER THAN 6, we need to ADD 200% of 6 TO 6
That is, 200% GREATER THAN 6 = 6 + (200% of 6) = 6 + (12) = 18
It's best to think of "greater than" in terms of PERCENT CHANGE.
Percent change = (100)(difference if values)/(original value)
So, "x is what percent greater than y?" translates into:
(100)(x - y)/2
The original question is asking "15 is what percent greater than 6?"
So, the percentage = (100)(15 - 6)/6
= (100)(9)/6
= 150%
Dear Brent,
I hope you can clarify two doubts I had when solving these problems :
1. http://greprepclub.com/forum/25-of-1-4-of-x-3575.html
why (1/4)(400)(x) and not (1/4)(1/400)(x) ? (and the same in quantity B)
2. http://greprepclub.com/forum/mary-paid-for-a-book-was-equal-to-the-price-of-the-book-plus-1819.html
why 1.04x dollars and not 0.04x dollars?
Link for question 1: http:/
Link for question 1: http://greprepclub.com/forum/25-of-1-4-of-x-3575.html
Sorry, that was a typo. I've changed it to 1/400
Link for question 2: http://greprepclub.com/forum/mary-paid-for-a-book-was-equal-to-the-price...
If the price of the book is x dollars, then the TOTAL price (including the 4% sales tax) = 1.04x
Here's why:
If the (before tax) price = x, then...
0.04x = the 4% tax
So, the TOTAL price = x + 0.04x = 1.04x
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