



 
Hi Monique, Suppose you have a purchase of $A before taxes. The GST is 5% of the before taxes price so
The PST is 8% of the before taxes price so
Thus the total after taxes cost is
This method gives you the two taxes you pay as well as the total cost. If you just want the total cost you can find it in one calculation since
I hope this helps,  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 