Questions about the world of GRE Math from other sources and general math related questions.
dddannie6
Course Students
 
Posts: 20
Joined: Mon May 07, 2012 12:36 pm
 

Question 37 on the big book p.g 485

by dddannie6 Fri Jan 10, 2014 3:12 pm

Hi,

So the question goes as follow:

An item costs x dollars where x is a positive integer.

Quantity A:
The price of the item after a 10% discount and then a $10 off coupon are applied

Quantity B:
The price of the item after a $10 off coupon and then 10% discount are applied


I understand that if you choose special numbers the answer seems to come out to be B every time. However, one thing that is not specified is that the original amount should be more than 10 dollars. If the amounts we pick to test this is 5, for example, than we end up in both situations having nothing left after the 10 dollar discount which would then make both columns equal and subsequently make the answer D since in some instances the answer is B and in others (where the original amount is less than 10) the answer is C.

Am I missing something here?

-Dannialles
tommywallach
Manhattan Prep Staff
 
Posts: 1917
Joined: Thu Mar 31, 2011 11:18 am
 

Re: Question 37 on the big book p.g 485

by tommywallach Sun Jan 12, 2014 2:12 pm

Hey DDD,

Hmm. I see what you're saying, and maybe we could clarify it (I'll run it by our curriculum person). However, you can't really apply a $10 off coupon to something that costs less than $10 (in real life, there's no coupon in the world that makes something free), so I think we're just expecting that logic to hold here.

-t