each day, there is a buy back limit price, which cannot be more...

each day, there is a buy back limit price, which cannot be more than 5% more the previous 5 days trading average

GBE's announcement states yesterday's limit was 15 cents but my calculations get 15.5 cents, that is, a buy back limit of 0.15699

...

value volume VWAP
6/06/2012 $18,674 123,828 0.15081
7/06/2012 $37,994 240,283 0.15812
8/06/2012 $3,704 23,933 0.15477
12/06/2012 $34,950 233,000 0.15000
13/06/2012 $151,255 1,028,188 0.14951 0.15699
$246,577.00 1,649,232 0.14951 0.15699