An airport parking lot charges a basic fee of $2 plus $1 per half-hour parked. What is the total charge from parking in the lot for 72 hours?

There are 2 half-hour periods in each hour, so 72 hours equals 72 × 2 = 144 half-hour periods. At $1 per period, the parking charge is $144; adding the $2 basic fee gives $146, which is choice b.

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