The table shows the parking rates at a carpark.
Duration |
Charges |
First 3 hours |
$6.00 |
After the third hour |
$1.70 per 12 hour or part thereof |
Gwen paid $21.30 for her parking charges. What was the greatest number of hours she parked her car at the carpark?
Amount that Gwen paid for the first 3 hours = $6.00
Amount that Gwen paid after the third hour
= 21.30 - 6.00
= $15.30
Number of sets of $1.70
= 15.30 ÷ 1.70
= 9
Duration of the additional time
= 9 x
12 = 4.5 h
Greatest number of hours that Gwen parked her car at the carpark
= 3 + 4.5
= 7.5 h
Answer(s): 7.5 h