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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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