The table shows the parking fees at a car park.

Time	Charges
First 1 hour or less	$1.80
Every additional 30 minutes or part thereof	$1.30
Overnight parking from 10 p.m. to 6:30 a.m.	$10

1. Archie parked his car at the carpark at 9.00 a.m. for 1 hour and 31 minutes. How much did he have to pay?
2. Penelope parked her car at the car park from 3:10 p.m. on Monday to 8 a.m. on Tuesday. Find the amount of parking fee that she had to pay.

(a)
Amount that Archie had to pay for 1 hour and 31 minutes
= 1.80 + 1.30 + 1.30
= $4.40

(b)
1 h = 60 min

From 3:10 p.m. to 4:10 p.m.: 1 h
Amount that Penelope had to pay from 3:10 p.m. to 4:10 p.m = $1.80

From 4:10 p.m. to 10:00 p.m.: 5 h 50 min

5 h 50 min = 5 x 60 + 50 = 350 min

Number of sets of additional 30 minutes in 5 h 50 min
= 350 ÷ 30
= 11 r 20

Number of sets of additional 30 minutes that Penelope had to pay for 
= 11 + 1
= 12

Amount that Penelope had to pay for all the additional 30 minutes or part thereof for 5 h 50 min
= 12 x 1.30
= $15.60

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

From 6.30 a.m. to 8 a.m.: 1 h 30 min

1 h 30 min = 1 x 60 + 30 = 90 min

Number of sets of additional 30 minutes in 1 h 30 min
= 90 ÷ 30
= 3

Amount that Penelope had to pay for all the additional 30 minutes or part thereof for 1 h 30 min
= 3 x 1.30
= $3.90

Total amount that Penelope had to pay
= 1.80 + 15.60 + 10 + 3.90
= $31.30

Answer(s): (a) $4.40; (b) $31.30