TP, the way I interpret the levels under $50M, $50-100M and > $100M is that these apply to the AUD amount of the award. Check a few posts up as they have worked examples by POH which is in AUD. The reason why US$ gets involved is because the claim amount is for $US 300M and US is the default international currency. For example if the maximum award is determined US$300M, then convert that to AUD $422.545M. For that amount the total payout pool will be
0.3 x $50M + 0.5 x $50M + 0.7 x $322.5M
= 15M + 25M + 225.8M
= 265.8M
= 16.82 cps