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| Math Central | Quandaries & Queries |
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Question from ken: I am trying to find out what was the amount of the GST that was added in $2,319.45 Ken |
Hi Ken,
I assume that there is no PST on this item and the GST is $5\%.$
Suppose the the price of the item before the GST is added is $P$ dollars. Since you paid $\$2,319.45$ you know that
\[1.05 \times P = 2,319.45.\]
Divide both sides of this equation by $1.05$ to get
\[P = \frac{2,319.45}{1.05}.\]
The GST you paid is then the difference between $P$ and $\$2,319.45.$
Penny
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