FIFO workers & SGC

Hi, 

From the Mining Industry Award MA000011, it states that the ordinary hours (38) are to be multiplied by the number of working and non working days in the cycle (21), which is then divided by (7) to determine ordinary time hours in a work cycle. 

Calculating the equation (38 x 21)/7 equals 114 per cycle.

Based on working 24/84/60 hours over 3 pay weeks (ie 2 x 84 hours = 168 hours), how can I setup SGC deductions to ensure compliance with the Award?

Do I create a new super deduction rate of 7.47% on all hours based on SGC applicable only on 114 hours (114 hours divided by 168 hours = 0.0747)? 

Any other suggestions as to how to calculate SGC would be appreciated. 

Regards 

Gary