The table shows the parking fees at a car park.

Time	Charges
First 1 hour or less	$2.90
Every additional 30 minutes or part thereof	$2.30
Overnight parking from 10 p.m. to 6:30 a.m.	$10

1. David parked his car at the carpark at 8.00 a.m. for 1 hour and 32 minutes. How much did he have to pay?
2. Gabby parked her car at the car park from 4:40 p.m. on Monday to 10 a.m. on Tuesday. Find the amount of parking fee that she had to pay.

(a)
Amount that David had to pay for 1 hour and 32 minutes
= 2.90 + 2.30 + 2.30
= $7.50

(b)
1 h = 60 min

From 4:40 p.m. to 5:40 p.m.: 1 h
Amount that Gabby had to pay from 4:40 p.m. to 5:40 p.m = $2.90

From 5:40 p.m. to 10:00 p.m.: 4 h 20 min

4 h 20 min = 4 x 60 + 20 = 260 min

Number of sets of additional 30 minutes in 4 h 20 min
= 260 ÷ 30
= 8 r 20

Number of sets of additional 30 minutes that Gabby had to pay for 
= 8 + 1
= 9

Amount that Gabby had to pay for all the additional 30 minutes or part thereof for 4 h 20 min
= 9 x 2.30
= $20.70

From 10:00 p.m. to 6.30. a.m. 
Amount that Gabby had to pay from 10:00 to 6.30 a.m. = $10

From 6.30 a.m. to 10 a.m.: 3 h 30 min

3 h 30 min = 3 x 60 + 30 = 210 min

Number of sets of additional 30 minutes in 3 h 30 min
= 210 ÷ 30
= 7

Amount that Gabby had to pay for all the additional 30 minutes or part thereof for 3 h 30 min
= 7 x 2.30
= $16.10

Total amount that Gabby had to pay
= 2.90 + 20.70 + 10 + 16.10
= $49.70

Answer(s): (a) $7.50; (b) $49.70