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PITA & hidden plug-In drill MCQ
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Updated on: 29 Jan 2019, 09:07
Updated on: 29 Jan 2019, 09:07
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The 200 seventh graders at John Witherspoon Middle School raised 80% of the funds needed for a field trip. The school donated the remaining 20%. When they went to purchase the tickets, however, they were given a 10% bulk rate discount after a $20 processing fee. Faced with an unexpected surplus the students chose to buy each member of the class one cookie and were still left with $18, which they gave to the bus driver. If each of the cookies cost $0.30, how much did the trip cost the school?
A)$40
b)$80
C)$120
D)$160
E)$200
In the answer explanation, it stated that" added the processing fee back again after subtraction", I couldn't get this point?
If anyone can help in the solution Please.
A)$40
b)$80
C)$120
D)$160
E)$200
In the answer explanation, it stated that" added the processing fee back again after subtraction", I couldn't get this point?
If anyone can help in the solution Please.
Re: PITA & hidden plug-In drill MCQ
[#permalink]
29 Jan 2019, 09:38
29 Jan 2019, 09:38
Expert Reply
SKH121 wrote:
The 200 seventh graders at John Witherspoon Middle School raised 80% of the funds needed for a field trip. The school donated the remaining 20%. When they went to purchase the tickets, however, they were given a 10% bulk rate discount after a $20 processing fee. Faced with an unexpected surplus the students chose to buy each member of the class one cookie and were still left with $18, which they gave to the bus driver. If each of the cookies cost $0.30, how much did the trip cost the school?
A)$40
b)$80
C)$120
D)$160
E)$200
In the answer explanation, it stated that" added the processing fee back again after subtraction", I couldn't get this point?
If anyone can help in the solution Please.
A)$40
b)$80
C)$120
D)$160
E)$200
In the answer explanation, it stated that" added the processing fee back again after subtraction", I couldn't get this point?
If anyone can help in the solution Please.
Hi,
I wouldn't say that the language is too great.
But the explanation..
I assume that the money collected was knowing there is a processing fee of $20..
so there is a discount of the remaining amount as that is the one that constitutes the rate part, that is rate per person *200..
discount or saving = 0.1(x-20)..
now money used is 0.3 * 200 for cookies and 18 for the driver so 0.3*200+18=60+18=78...
Thus equating savings with the expenditure thereafter =>
0.1(x-20)=78..
0.1x-2=78...
0.1x=80 or x=800
But the school spends 20% of it so 800*20/100=160
gmatclubot
Re: PITA & hidden plug-In drill MCQ [#permalink]
29 Jan 2019, 09:38
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