Employment regulation in PNG

hye everybody.. I am planning to send an employee to take care of our project in PNG. However we are having difficulties in understanding the tax , and other employment processes in PNG.
1-How to calculate the tax for our employee who will be paid on monthly basis as we just awarded with the project and have not setup any office yet in PNG.
2-is there any other compulsory contribution e.g social security contribution that must deduct from his salary
3-what is the best insurance and how do we apply

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