The table shows the parking rates at a carpark.
Duration |
Charges |
First 3 hours |
$10.00 |
After the third hour |
$2.80 per 12 hour or part thereof |
Mary paid $29.60 for her parking charges. What was the greatest number of hours she parked her car at the carpark?
Amount that Mary paid for the first 3 hours = $10.00
Amount that Mary paid after the third hour
= 29.60 - 10.00
= $19.60
Number of sets of $2.80
= 19.60 ÷ 2.80
= 7
Duration of the additional time
= 7 x
12 = 3.5 h
Greatest number of hours that Mary parked her car at the carpark
= 3 + 3.5
= 6.5 h
Answer(s): 6.5 h