The table shows the parking fees at a car park.

Time	Charges
First 1 hour or less	$2.10
Every additional 30 minutes or part thereof	$1.30
Overnight parking from 10 p.m. to 6:30 a.m.	$9

1. Cody parked his car at the carpark at 11.00 a.m. for 1 hour and 43 minutes. How much did he have to pay?
2. Opal parked her car at the car park from 3:20 p.m. on Monday to 8 a.m. on Tuesday. Find the amount of parking fee that she had to pay.

(a)
Amount that Cody had to pay for 1 hour and 43 minutes
= 2.10 + 1.30 + 1.30
= $4.70

(b)
1 h = 60 min

From 3:20 p.m. to 4:20 p.m.: 1 h
Amount that Opal had to pay from 3:20 p.m. to 4:20 p.m = $2.10

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

5 h 40 min = 5 x 60 + 40 = 340 min

Number of sets of additional 30 minutes in 5 h 40 min
= 340 ÷ 30
= 11 r 10

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

Amount that Opal had to pay for all the additional 30 minutes or part thereof for 5 h 40 min
= 12 x 1.30
= $15.60

From 10:00 p.m. to 6.30. a.m. 
Amount that Opal had to pay from 10:00 to 6.30 a.m. = $9

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 Opal 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 Opal had to pay
= 2.10 + 15.60 + 9 + 3.90
= $30.60

Answer(s): (a) $4.70; (b) $30.60