Math CentralQuandaries & Queries


Question from Claude:

I need to know the GST I paid for items bought. What is the simple formula to calculate the GST paid from the total. Some merchants do not clearly indicate the amount of GST on their sale receipt.


What you do depends on whether the price you paid also includes the PST. If the price included the PST and GST then look at my response to Janet who also lives in Ontario so the rates are the same as yours. If the PST is not charged on the item you purchase then to find the price before the 5% GST is added, divide the amount you paid by 1.05.

I hope this helps,

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