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OG explanation not registering...

Author Message
Manager
Joined: 30 Jul 2011
Posts: 114

Kudos [?]: 29 [0], given: 24

Location: United States (NJ)
Concentration: General Management, Finance
GMAT 1: 520 Q40 V21
GPA: 2.95

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15 Aug 2011, 15:28
00:00

Difficulty:

35% (medium)

Question Stats:

73% (00:49) correct 27% (01:57) wrong based on 11 sessions

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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?

a. \$11.73
b. \$12.00
c. \$13.80
d. \$14.00
e. \$15.87

[Reveal] Spoiler:
Wouldn't you multiply 207 by (1-.15) to calculate the cost of the meal (WITHOUT gratuity)? And then divide evenly by 15 people?
[Reveal] Spoiler: OA

Kudos [?]: 29 [0], given: 24

Director
Joined: 01 Feb 2011
Posts: 726

Kudos [?]: 143 [0], given: 42

Re: OG explanation not registering... [#permalink]

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15 Aug 2011, 16:16
price of the meal per person including gratuity = 207/15

we know here the gratuity was 15%. lets say price of one meal = p

=>(115/100)p = 207/15

=> p = price of the meal without any gratuity = (207*100)/(15*115) = \$12

Kudos [?]: 143 [0], given: 42

Re: OG explanation not registering...   [#permalink] 15 Aug 2011, 16:16
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