







The original price before a discount and taxes 
20151209 

Michelle pose la question : Good day,
I would like to know if there is a particular equation to validate the following information:
I had to find the original cost of an item sold for 759.36$ before a 25% discount and 13% taxes.
I know we must use separate question to obtain the answer but I am unsure how to write the equation to validate my answer. Penny Nom lui répond. 





If I know only the tax amount, how do I figure out total cost? 
20130811 

Patric pose la question : If I know only the tax amount, how do I figure out total cost? Penny Nom lui répond. 





How much does Sara get to take home 
20130605 

Jessica pose la question : Sara gets paid $15.00 an hour. She worked 80 hours during the pay period. If 28% of what she earned is deducted for taxes, how much does Sara get to take home? Penny Nom lui répond. 





Quebec taxes 
20130206 

Cheryl pose la question : can you please tell me the equation to calculate the Quebec taxes (5% & 9.975%) individually from the total?
thank you Penny Nom lui répond. 





Sales taxes in Quebec 
20100428 

carole pose la question : I work at a company where we use transport companies and we often get credits
on their invoices. I need to know how to subtract the sales taxes from these credit amounts.
(5% TPS and 7.5% TVQ).
Is the equation: Amount / 1.05 = then this amount / by 1.075=? Penny Nom lui répond. 





GST and PST 
20100324 

z pose la question : Hello math Central,
What is the math formula and method I can use, IN 1 STEP to extract ONLY both(pst/gst) & or gst TAXES from the total sale/purchase? Harley Weston lui répond. 





Mill 
20100126 

Kenneth pose la question : Is a mill, as it pertains to property taxes, regarded as a unit of measure like a meter or an hour, etc? Robert Dawson lui répond. 





The graph of f(x)=1/x 2 
20091129 

Kapilan pose la question : Please answer the following question:
Sketch the graph of f(x)=1/x 2 Harley Weston lui répond. 





Taxes in Taxylvania 
20081022 

April pose la question : Taxylvania has a tax code that rewards charitable giving. If a person gives p% of his income to charity, that person pays (351.8p)% tax on the remaining money. For example, if a person gives 10% of his income to charity, he pays 17 % tax on the remaining money. If a person gives 19.44% of his income to charity, he pays no tax on the remaining money. A person does not receive a tax refund if he gives more than 19.44% of his income to charity. Count Taxula earns $27,000. What percentage of his income should he give to charity to maximize the money he has after taxes and charitable giving? Harley Weston lui répond. 





Cost before and after the GST 
20081001 

bruce pose la question : Hi, i seem confused on this topic:
If i need to add say 10% GST to a cost then i would times it by 1.1.
If i need to reduce the cost by 10% then i need to divide it by 1.1. that is all well and good.
What if i need to add 12%, 18% or 20% what is the formula then? Penny Nom lui répond. 





The selling price 
20080904 

Robert pose la question : Client wants to sell his property providing he is left with 100000.00$ net.
How do I calculate selling price if commission is 6% and taxes on the commission 6% Fed and 7.5%prov.
I'm taking the real estate class and this one really got me. Penny Nom lui répond. 





Vectors and an orientation change in the axes 
20080830 

moumita pose la question : what differences take place to a vector because of choice of orientation of the coordinate axes and why?? Harley Weston lui répond. 





GST and PST 
20080825 

Monique pose la question : okay i live in ontario and i want to find out what my grand total will be so
i know how much i will have to pay...
so if i have a before tax total of $48.40... what will my grand total be? with
GST and PST i know that GST=5% and PST=8% Penny Nom lui répond. 





What is the taxable amount? 
20071002 

Mark pose la question : If I know the amount of GST or PST collected is there a calculation to find out what the taxable amount was.
eg. 1.50 GST collected. GST is 6%. What is the taxable amount.
eg. 2.00 PST collected. PST is 8%. What is the taxable amount. Stephen La Rocque lui répond. 





GST and PST 
20070811 

Cynthia pose la question : I paid $15.98 for an item. Both GST (.96) & PST ($1.12) were added for a total of $18.06. I know that .96 is GST (6%) and $1.12 is PST (7%).
Other than looking at the receipt, if all I have is the total amount paid, how do I calculate how much of the total are taxes? Penny Nom lui répond. 





Sales before tax 
20050209 

Lynda pose la question : I know my total sales for the month, which includes sales tax. How do I get to the sales dollars before the sales tax? Penny Nom lui répond. 





Counterclockwise 
20010914 

Rolanda pose la question : When Descartes invented the coordinate system he decided to number them counterclockwise. Why? Chris Fisher lui répond. 

