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	$2.60
Overnight parking from 10 p.m. to 6:30 a.m.	$12

1. Sean parked his car at the carpark at 9.00 a.m. for 1 hour and 37 minutes. How much did he have to pay?
2. Gem parked her car at the car park from 1:20 p.m. on Monday to 11 a.m. on Tuesday. Find the amount of parking fee that she had to pay.

(a)
Amount that Sean had to pay for 1 hour and 37 minutes
= 2.90 + 2.60 + 2.60
= $8.10

(b)
1 h = 60 min

From 1:20 p.m. to 2:20 p.m.: 1 h
Amount that Gem had to pay from 1:20 p.m. to 2:20 p.m = $2.90

From 2:20 p.m. to 10:00 p.m.: 7 h 40 min

7 h 40 min = 7 x 60 + 40 = 460 min

Number of sets of additional 30 minutes in 7 h 40 min
= 460 ÷ 30
= 15 r 10

Number of sets of additional 30 minutes that Gem had to pay for 
= 15 + 1
= 16

Amount that Gem had to pay for all the additional 30 minutes or part thereof for 7 h 40 min
= 16 x 2.60
= $41.60

From 10:00 p.m. to 6.30. a.m. 
Amount that Gem had to pay from 10:00 to 6.30 a.m. = $12

From 6.30 a.m. to 11 a.m.: 4 h 30 min

4 h 30 min = 4 x 60 + 30 = 270 min

Number of sets of additional 30 minutes in 4 h 30 min
= 270 ÷ 30
= 9

Amount that Gem had to pay for all the additional 30 minutes or part thereof for 4 h 30 min
= 9 x 2.60
= $23.40

Total amount that Gem had to pay
= 2.90 + 41.60 + 12 + 23.40
= $79.90

Answer(s): (a) $8.10; (b) $79.90