>Re: the calculation, I'd just back out the values in the reverse order they were originally calculated.
>
>If you start with total value $574.88 (actually $575.875), that is 1.095 * ( Price + FedTax ), so
>
>( Price + FedTax ) = 574.88 / 1.095, = 525.00
>
>Then, ( Price + FedTax ) = Price * 1.05, so
>
>Price = ( Price + FedTax ) / 1.05, = 525.00 / 1.05, = 500.00
>
>If you want to do it all in one step:
>
>T = total dollar value including all taxes
>P = provincial tax rate as a decimal e.g. 9.5% = 0.095
>F = federal tax rate as a decimal e.g. 5% = 0.05
>I = item price
>
>Then I = ( T / ( 1 + P ) ) / ( 1 + F )

We do not have the total dollar value including all taxes, as defined here with the T variable. This is the hole problem here we have to workaround. The only thing I have is the total amount for the taxes, which is 74.88$ in our example. From that amount, we have to go back to 500.00$, as we test for Quebec presently. So, this is why, in the other thread, Gregory is working on that fancy method to reverse engineer the entire process.