How do you calculate GST and PST?

To calculate Goods and Services Tax (GST) and Provincial Sales Tax (PST), you first determine the taxable amount of the purchase. Multiply this amount by the applicable GST rate (usually 5% in Canada) and the PST rate (which varies by province) to find the tax amounts. Add the GST and PST amounts together to get the total sales tax. Finally, add the total sales tax to the original purchase price to find the total amount payable.