Hi Biarra and Crazyman, sorry to add my two cents late but...

Hi Biarra and Crazyman, sorry to add my two cents late but Biarra's formula above needs to be one of the following:

(Amex price / 200) / aud to usd exch rate
(0.67 / 200) / .73 = .004589

or more correctly imo:

(Amex price x usd to aud exch rate) / 200
(0.67 x 1.34) / 200 = .004489 [not sure of usd to aud exch at time of your post]

You were not far off as the Amex price and aud to usd ex are close at the moment, if you plug in an adr price of say $1.20 (why be negative?) you will see what I mean [(0.75/200)/1.2 = .003125] ! Current price still rounds up to half a cent, but is not quite as high as you may have calc'd. Apologies if I've gone a bit 'professor panelvandan' over a simple miss-key.