Source: Official Guide for the GMAT 12th Ed. Section 5.3 Problem Solving; #123

1

The price of lunch for 15 people

The price of lunch for 15 people was $207.00, including a 15 percent gratuity for service. What was the average price per person, EXCLUDING the gratuity? $11.73, $12.00, $13.80, $14.00, $15.87

2 Explanations

1

Tom Yang

if we assume that the total price is 207 then 85% * 207 should be the price of the meal ?

Apr 3, 2013 • Comment

Chris Swimmer, Magoosh Tutor

Hello Tom! Actually the total price ($207) is 115% of the original price, so

207 = 1.15x
207/1.15 = x
180 = x

Check out this blog for some more work on this type of problem:

http://magoosh.com/gre/2012/inverse-proportions-on-the-gre-the-flip-it-method/

Apr 5, 2013 • Reply

2

Gravatar Mike McGarry, Magoosh Tutor

Nov 6, 2012 • Comment

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Section 5.3 Problem Solving

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