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Question:

Following are the car parking charges near a railway station up to:
Time | Parking charges
4 hours | Rs. 60
8 hours | Rs. 100
12 hours | Rs. 140
24 hours | Rs. 180
Check if the parking charges are in direct proportion to the parking time.

Solution:

Ratio of parking charges to no. of hours are:
60/4 = 15
100/8 = 12.5
140/12 = 35/3 ≈ 11.67
180/24 = 15/2 = 7.5
Each ratio is not the same.
So, the parking charges are not in direct proportion to the parking time.