Cheapest Dimsum

Had siew mai, prawn dumplings, fishballs, spare ribs etc altogher 5 crates,
and additional of porridge, zhu cheong fan etc with my dad and sister (working temporarily at a dimsum company's office),
The total price should be around RM30 plus, close to RM40.
But we ended up eating the cheapest dimsum ever.
I guess we had a 70% discount for whatever food we ate. Didn't know food also have discounts like clothes...
My dad took out a RM10 note with eyes wide open and kept saying, 'this must be a joke!'
Yes, the lunch costs only RM9.60. Some more got changes back to my dad.

It wasn't because the cashier miscalculated and it wasn't a joke,
it was because of my sister working there...
felt so lucky to have her as my sister...hahaha