Producing a customs agent invoice for GST on imported goods in NZ

I have a customs GST/Duty invoice to pay and enter into MYOB Essentials. Have read other postings on this subject but need to know the factor to multiply the GST by for 15% rate.

The invoice is as follows: -

Customs service fee import    42.82 liable for 15% GST

GST  2988.46

Customs Duty import  1724.80

Total GST free  4713.26

Sub Total:  4756.08

GST:  6.42

Total Due: 4762.50

Thanks for your help with this