I believe I am making this much harder than it really is. please let me know.
The price of lunch for 15 peoplewas $207.00including a 15% gratuity for service. What was the average price per person, Excluding gratuity?
a.11.73
b.12.00
c.13.80
d.14.00
e.15.87
qa iis B i chose A
og ps 123
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I would simply plug-in the results and see what fits. The most attractive option to start with is B , because 12 is an easy to number to do calc with.Enginpasa1 wrote:I believe I am making this much harder than it really is. please let me know.
The price of lunch for 15 peoplewas $207.00including a 15% gratuity for service. What was the average price per person, Excluding gratuity?
a.11.73
b.12.00
c.13.80
d.14.00
e.15.87
qa iis B i chose A
If the average price per person is 12, then 15 people paid 15 X 12 = 180 for their lunch, without gratuity. gratuity is 15%, or 180 X 15 / 100 = 27. 180 + 27 = 207 which was the total price they paid, so answer B.
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X(Lunch Price) + 15%X = 207
X( 1 + 3/20) = 207
23X/20=207
X= 180
Average = 180(Lunch price)/15(Number of people)
Average = 12
The key here is realizing that 15% is 3/20...and that 207/23 is 9..(This question shouldn't take you more the 40 secs if you recognize these two steps)
I don't like the testing numbers strategy because if you aren't lucky, you will waste time.
IF YOU HAVE TO MULTIPLY OR DIVIDE A PERCENT/DECIMAL, CONSIDER FRACTIONS!!
X( 1 + 3/20) = 207
23X/20=207
X= 180
Average = 180(Lunch price)/15(Number of people)
Average = 12
The key here is realizing that 15% is 3/20...and that 207/23 is 9..(This question shouldn't take you more the 40 secs if you recognize these two steps)
I don't like the testing numbers strategy because if you aren't lucky, you will waste time.
IF YOU HAVE TO MULTIPLY OR DIVIDE A PERCENT/DECIMAL, CONSIDER FRACTIONS!!
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yea, good point...you can get stuck in endless calculations which might take forever in GMAT to calculate 207/1.15.
I realized this and then used second method - substituting the answers and luckily 12 (first easy number) worked out perfectly.
But, I agree, fractions work better / quicker in this case.
I realized this and then used second method - substituting the answers and luckily 12 (first easy number) worked out perfectly.
But, I agree, fractions work better / quicker in this case.