Just check all Acorn's share holdings.
Acorn holds 19,174,622 shares (30 March 2011)
Total cost for that is A$13,951,748.15
Average price: 0.728/share.
If they bought more in last 2 months (they need to buy around another 2.5 million shares before they make another "change in substantial holding" announcement). Their average price should be around 0.75/share.
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