Welcome to Australia's leading independent Frequent Flyer and Travel Resource since 1998!Our site contains tons of information that will improve your travel experience.Joining AFF is fast, simple & absolutely free - register now and take immediate advantage of these great BENEFITS. Once registered, this box will disappear. And you will see fewer advertisements :)
However, I was led to believe this was to be based on the zones for the segments. As there are no direct CHC<->PER flights you need to travel via an intermediate port. eg SYD i.e. PER-SYD + SYD-CHC + CHC-SYD + SYD-PER. All are "zone 3" or 18,000 points; a total of 72,000 points.
I am not sure why the table is indicating "Zone 4" :? ; as a result the only thing certain is the answer is either 50,000 or 72,000 points. :?
You only add the segment zone costs if you stop in Sydney. The routing will likely be PER-SYD-CHC-SYD-PER, and the points cost is for the distance travelled between stopovers. So PER-SYD-CHC is 2041+1323=3364 miles. That fits into zone 4. So for the return trip you need 2 x zone 4 awards which is 50,000 points total in economy (2 x 25,000 points).
If you want to stopover in Sydney, it then becomes 2 x zone 3 awards for PER-SYD and SYD-CHC for 18,000 points each. Stopover in both directions and its 72,000 points total.