Separately, it is trivial to calculate the tax using either method. Sorry you have trouble.Really. Maybe you would like to show me the calculation for the tax on a $99.44 item using the 23% tax inclusive rate. Using the 29.87% exclusive rate it's:
99.44 x .2987 = $29.70Let's see your calculations.
99.44*1.2987
There it is. Trivial. 1.2987 IS 1+23/77. No worries.