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a parking lot charges its rental in the following way- first three hou

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a parking lot charges its rental in the following way- first three hou  [#permalink]

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New post 21 Mar 2018, 22:50
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  25% (medium)

Question Stats:

76% (01:51) correct 24% (01:37) wrong based on 73 sessions

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a parking lot charges its rental in the following way- first three hour cost $5, every additional hour costs $3 until a total of eight hours and thereafter, every additional hour costs $4. Alternately, one can pay flat $20 beforehand for 12 hours, Kevin was not aware of the second option and parked his car for exactly 12 hours without making the upfront payment and thus, was charged the first way. How many dollars could kevin have saved if he had been aware of the second option?
A. 6
B. 10
C. 14
D. 16
E. 22
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Re: a parking lot charges its rental in the following way- first three hou  [#permalink]

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New post 21 Mar 2018, 23:22
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rishabhmishra wrote:
a parking lot charges its rental in the following way- first three hour cost $5, every additional hour costs $3 until a total of eight hours and thereafter, every additional hour costs $4. Alternately, one can pay flat $20 beforehand for 12 hours, Kevin was not aware of the second option and parked his car for exactly 12 hours without making the upfront payment and thus, was charged the first way. How many dollars could kevin have saved if he had been aware of the second option?
A. 6
B. 10
C. 14
D. 16
E. 22


First Way
Charge = 5+ (3*5) + (4*4) = 36

Second way = 20
Savings possible = 36-20 = 16$
D
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Re: a parking lot charges its rental in the following way- first three hou  [#permalink]

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New post 22 Mar 2018, 10:26
rishabhmishra wrote:
a parking lot charges its rental in the following way- first three hour cost $5, every additional hour costs $3 until a total of eight hours and thereafter, every additional hour costs $4. Alternately, one can pay flat $20 beforehand for 12 hours, Kevin was not aware of the second option and parked his car for exactly 12 hours without making the upfront payment and thus, was charged the first way. How many dollars could kevin have saved if he had been aware of the second option?
A. 6
B. 10
C. 14
D. 16
E. 22


Total hours Kevin charged for : 12 hrs

Way - 1 charges are as follow for 12 hrs:

First 3 hrs = $ 5.00 -----(I)

For next 5 hrs (4th, 5th, 6th, 7th, 8th) = $3 per hour

means $3 * 5 = $ 15.00 -----(II)

For next 4 hrs (9th, 10th, 11th, 12th) = $4 per hour

means $4 * 4 = $ 16 -----(III)

Add I, II, III

5 + 15 + 16 = 36

Way - 2 charges for 12 hours = $20

Possible saving for Kevin = 36 - 20 = $16

Hence (D)
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a parking lot charges its rental in the following way- first three hou  [#permalink]

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New post 23 Mar 2018, 12:45
rishabhmishra wrote:
a parking lot charges its rental in the following way- first three hour cost $5, every additional hour costs $3 until a total of eight hours and thereafter, every additional hour costs $4. Alternately, one can pay flat $20 beforehand for 12 hours, Kevin was not aware of the second option and parked his car for exactly 12 hours without making the upfront payment and thus, was charged the first way. How many dollars could kevin have saved if he had been aware of the second option?
A. 6
B. 10
C. 14
D. 16
E. 22


If Kevin was charged the first way for 12 hours of parking, he was charged:

5 + 5(3) + 4(4) = 5 + 15 + 16 = 36 dollars

So he would have saved 36 - 20 = 16 dollars.

Answer: D
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a parking lot charges its rental in the following way- first three hou &nbs [#permalink] 23 Mar 2018, 12:45
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