The table shows the parking rates at a carpark.
Duration |
Charges |
First 3 hours |
$7.00 |
After the third hour |
$1.80 per 12 hour or part thereof |
Diana paid $21.40 for her parking charges. What was the greatest number of hours she parked her car at the carpark?
Amount that Diana paid for the first 3 hours = $7.00
Amount that Diana paid after the third hour
= 21.40 - 7.00
= $14.40
Number of sets of $1.80
= 14.40 ÷ 1.80
= 8
Duration of the additional time
= 8 x
12 = 4 h
Greatest number of hours that Diana parked her car at the carpark
= 3 + 4
= 7 h
Answer(s): 7 h