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Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calc

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GMAT 1: 670 Q46 V36
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Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calc  [#permalink]

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New post Updated on: 30 Mar 2019, 12:02
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Question Stats:

50% (03:20) correct 50% (02:14) wrong based on 18 sessions

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Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calculates the dollar amount of the tip as 3 times the tens digit of the amount of his bill. If the amount of Tom’s most recent cafeteria bill was 2-digit integer, was the tip calculated by Tom on this bill greater than 20 percent of the amount of the bill?

(1) The amount of the bill excluding tip was over $20
(2) The tip calculated by Tom was at least $4

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Originally posted by dabaobao on 30 Mar 2019, 11:50.
Last edited by dabaobao on 30 Mar 2019, 12:02, edited 1 time in total.
Senior Manager
Senior Manager
User avatar
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Joined: 24 Oct 2016
Posts: 375
GMAT 1: 670 Q46 V36
GMAT 2: 690 Q47 V38
Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calc  [#permalink]

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New post 30 Mar 2019, 12:00
dabaobao wrote:
Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calculates the dollar amount of the tip as 3imes the tens digit of the amount of his bill. If the amount of Tom’s most recent cafeteria bill was 2-digit integer, was the tip calculated by Tom on this bill greater than 20 percent of the amount of the bill?

(1) The amount of the bill excluding tip was over $20
(2) The tip calculated by Tom was at least $4



Similar to Q: https://gmatclub.com/forum/whenever-mar ... l#p2251680

Solution:



Trick: Min/Max



List the Ranges:
Bill Range: 11-19, 21-29, 31-39, ...
Tip Range: 2<x<4, 4<x<6, ...
Actual Tip: 3, 6, 9, ...

Simplify the Q



Notice, tip > 20% of the bill when:
1) bill > 20
2) tip > $3

Hence the Q is asking:

Is bill > 20 or tip > 3?

1) bill > 20. Sufficient
2) Tip > 4. Sufficient

Hence, answer = D.

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KUDOS

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Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calc   [#permalink] 30 Mar 2019, 12:00
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Whenever Tom pays an amount of 2-digit integer in a cafeteria, he calc

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