The tax rate in NZ is 15%. Tax must be calculated from the price that is already on their in a backwards manner. E.g. if the price on the store shows $20 then this how the cost equation would work :
$20(Price On Store)= $3(Tax) + Actual Cost Price ($17) .
The actual cost price and tax has to be generated and tax should be excluded for all other countries except New Zealand. In New Zealand we call Tax, “GST” so we will need to make sure it is called that in the store.