DTers Weekend Aftermarket Lounge 19-22 May, page-6

ASX is wrong.

No need to put the 'c' at the end, once you've used a $ sign.

They use both versions here.

OPTION EXPIRING 30-JUN-2019
Exercise Price: $0.02c

• Company Appendix 3B New Issue Announcement (Nov 2016)  

• Options exercisable at $0.02 each on or before 30 June 2019

Money amounts are written as a
decimal.
The symbol ($) is used with the
decimal point.
Dollars and cents always have 2 digits to
the right of the decimal point.
1 cent $0.01​

2 cents $0.02, and so on