The table shows the parking rates at a carpark.
Duration |
Charges |
First 3 hours |
$9.00 |
After the third hour |
$1.10 per 12 hour or part thereof |
Usha paid $25.50 for her parking charges. What was the greatest number of hours she parked her car at the carpark?
Amount that Usha paid for the first 3 hours = $9.00
Amount that Usha paid after the third hour
= 25.50 - 9.00
= $16.50
Number of sets of $1.10
= 16.50 ÷ 1.10
= 15
Duration of the additional time
= 15 x
12 = 7.5 h
Greatest number of hours that Usha parked her car at the carpark
= 3 + 7.5
= 10.5 h
Answer(s): 10.5 h