The table shows the parking rates at a carpark.
Duration |
Charges |
First 4 hours |
$4.00 |
After the fourth hour |
$1.70 per 12 hour or part thereof |
Risa paid $31.20 for her parking charges. What was the greatest number of hours she parked her car at the carpark?
Amount that Risa paid for the first 4 hours = $4.00
Amount that Risa paid after the fourth hour
= 31.20 - 4.00
= $27.20
Number of sets of $1.70
= 27.20 ÷ 1.70
= 16
Duration of the additional time
= 16 x
12 = 8 h
Greatest number of hours that Risa parked her car at the carpark
= 4 + 8
= 12 h
Answer(s): 12 h