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| Math Central | Quandaries & Queries |
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Question from andy, a parent: what is the short formula to get the hst 13% out of the total price of an item |
Hi Andy,
Think about what you would do if you knew the price before the hst and you wanted to add the 13%. If the price before the hst were $\$P$ then you would find the cost $\$C$ after the hst by
\[1.13 \times \$P = \$C\]
If you divide both sides of this expression by $1.13$ you get
\[\$P = \frac{\$C}{1.13}\]
This is the formula you need. Divide the cost which includes the hst by 1.13 to find the price before the hst.
I hope this helps,
Penny
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