Ann: Notice of Special Meeting - Reverse Stock Split, page-14

New price per share is price at time of split multiplied by the split ratio, and your number of shares is divided by that same figure.

So, 10,000 shares today, if they were split at $0.755 at 1:50, then you'd end up with 200 shares worth $37.75 each.

10,000 shares today, if they were split at $0.755 at 1:5, then you'd end up with 2000 shares worth $3.775 each.

The total value of your holding doesn't change, obviously.

As they need to achieve a $4USD price for Nasdaq eligibility, it's not going to be a 1:5 split unless the share price increases significantly between now and then. With the current exchange rate and price, a $4USD price per share would need a 1:8 reverse split ($4USD = $5.97AUD, $5.97 / $0.755 = 7.91, round up to nearest whole and you get 8).