Radu's equations:
Price in AUD incl GST of 10% = P
Price in AUD excl GST of 10% = P * 10/11 = N
Price in NZD excl GST of 15% = N * Ex Rate = N * 1.13 (Oct 22, 2025) = Nz
Price in NZD inlc GST of 15% = Nz * 1.15 = Pnz
Pnz = Nz * 1.15 = N * 1.1305 * 1.15 = P * 10/11 * 1.13 * 1.15
For a numeric example, if P = 110 AUD => Pnz = 129.95 NZD
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