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| Math Central | Quandaries & Queries |
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Question from melissa: I need to know the amount of gst that was in the amount of 630.67? How do you figure this out? I don't need the amount of gst after, but the gst included? |
Hi Melissa,
This is one of those unusual math questions where the answer depends on where you live. In Saskatchewan where I line there is a pst and a gst so the amount after tax includes them both. Since you live in Alberta where there is no PST the amount paid, $630.67 only includes the ticket price of the item and the 5% gst. If you knew the ticket price, the price before the gst then you would calculate the gst be
gst = 5 % of the ticket price
which is
gst = 0.05 × the ticket price.
Hence the price you paid is
the ticket price + 0.05 × the ticket price = 1.05 × the ticket price = $630.67.
Hence
the ticket price = $630.67/1.05 = $600.64.
The difference between the price you paid and the ticket price is the gst.
Penny
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