Yun Fah Auto Services Cheating

This shop is located at manjalara Kepong. As last time I forgot to switch off the light and the car have run out of battery. And my car just park infont of this shop. After that I ask the boss to help me jump start and take about 30 second and the boss charge me RM 100 for the services. And did you think RM 100 is reasonable for 30 seconds simple jump start services ?