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Nan’s total parking

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Nan’s total parking

by sanju09 » Fri Aug 27, 2010 5:17 am
Yesterday Nan parked her car at a certain parking garage that charges more for the first hour than for each additional hour. If Nan's total parking charge at the garage yesterday was $3.75, for how many hours of parking was she charged?

(1) Parking charges at the garage are $0.75 for the first hour and $0.50 for each additional hour or fraction of an hour.

(2) If the charge for the first hour had been $1.00, Nan's total parking charge would have been $4.00.


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by Rich@VeritasPrep » Fri Aug 27, 2010 5:50 am
You can represent the prompt with an equation:

F + X*A = 3.75

where F is the charge for the first hour, X is the number of additional hours, and A is the charge per additional hour.

(1) tells you that F=0.75 and A=0.50. Therefore:

.75 + .50X = 3.75

You can find X and can thus find the total number of hours charged

SUFFICIENT

(2) gives you this equation:

1.00 + XA = 4.00

You know that XA must be 3.00, but we don't know anything else about either variable.

INSUFFICIENT
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