No it won't be $21. I was doing despatch last month and forgot
my cashcard no more money. I pass through the gantry 3 times in
that day then i remembered, but LTA only send me one letter. Maybe
they only fine you once per day~ hahaha~~
Anyway its not always $10.50, in fact it's not even a fine. They
put it very nicely saying you have to pay the ERP price (25, 50, or
75 cents) with no extra charge, but the administration fee is
$10... 
what crap!
