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The mall charges 50 cents for the first hour of parking and $3 for each additional hour until the customer reaches 4 hours, after that the parking fee is $1 per hour. If a certain customer parked his in the mall for 7 hours and 30 minutes, how much is he going to pay?
A. $11.5.
B. $12.
C. $13.
D. $14.5.
E. $15.
Correct Answer: C
Explanation/Reference:
Explanation:
The customer parked for 7 hours and 30 minutes. Divide the problem into parts:
The first hour cost him 0.5 dollars. He has 6.5 hours left. The next three hours cost him 3 dollars per hour, $9 in total for that time. He has (7.5 4 = 3.5 hours left) at a wage of $1 per hour, it sums up to 3.5 additional dollars.
Sum it all up: 0.5 + 9 + 3.5 = $13.
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