unuel', ), ); ?> A customer eats the lunch special at a restaurant and adds a tip : Data Sufficiency (DS)
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A customer eats the lunch special at a restaurant and adds a tip

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A customer eats the lunch special at a restaurant and adds a tip  [#permalink]

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New post 16 Apr 2018, 08:20
1
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A
B
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D
E

Difficulty:

  5% (low)

Question Stats:

96% (00:56) correct 4% (00:33) wrong based on 31 sessions

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A customer eats the lunch special at a restaurant and adds a tip of 15 percent to his bill. What was the total cost of the lunch, including the tip?

1) If the customer had left no tip, he would have paid $8.00 for the lunch.
2) The total cost of his lunch, including the tip, was 80 percent of the cost of the same meal at dinnertime, which is $11.50.

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Re: A customer eats the lunch special at a restaurant and adds a tip  [#permalink]

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New post 18 Apr 2018, 22:20
itisSheldon wrote:
A customer eats the lunch special at a restaurant and adds a tip of 15 percent to his bill. What was the total cost of the lunch, including the tip?

1) If the customer had left no tip, he would have paid $8.00 for the lunch.
2) The total cost of his lunch, including the tip, was 80 percent of the cost of the same meal at dinnertime, which is $11.50.


So if the customer's bill is $x, a tip of 15% of x = $0.15x is added. this makes total amount including the tip as = $1.15x. We need the value of x to determine the answer.

(1) We are given that bill without the tip or x = 8. Sufficient.

(2) We are given that total cost = 1.15x = 80% of 11.5. We can find x from this. Sufficient.

Hence D answer
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Re: A customer eats the lunch special at a restaurant and adds a tip  [#permalink]

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New post 30 Apr 2018, 20:23
I) Total cost =8 +15*8/100

II)total cost =(80/100)*11.5

Both statements individually give answer so D

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Re: A customer eats the lunch special at a restaurant and adds a tip &nbs [#permalink] 30 Apr 2018, 20:23
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