Saving even 4 dimes0.4元也要省

You can get 4 dimes rebate
if you top up the petrol at right volume.
This is because that the amount of money always
rounds off to integer.
For example :
If you top up the petrol for 28 liters
when oil price is 31.3 dollars per liter,
all you need to pay is 876 dollars
not 31.3 x 28 = 876.4 dollars. YA!!
加油的時候, 總金額的小數點以下是四捨五入,
所以如果你正好小數點以下是0.4元,
你就賺到了0.4元, 舉例來說 :
假如油價是31.3元, 加28公升,
31.3 x 28 = 876.4,
可是你只需要付876元, YA!!