Hi, We have been trying to set up some product with promotional pricing but it seems that the tax (GST) isn't calculating correctly on the checkout page.

see attached screenshot with promotional pricing and no promotional pricing.

the Tax (GST) rate should be 10%

(Dropbox links, as it seems i cannot add attachments)
www.dropbox.com/s/y4598gu6myosi6x/NoPromo(Correct%20TAX).png
www.dropbox.com/s/gfp5cq77ic0uac1/WithPr...Incorrect%20TAX).png

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