Calculating Sales Tax

[goatboy]

for some reason php is giving me incorrect numbers
lets say i do 137 / 7.25% it tells me the tax is 18.9 but it really should be something like $9
i tried it with 10% and it came out correctly, Am i doing something wrong here?

[AV1611]

dunno.  can we see the code?

[goatboy]

that's pretty much what it looks like

$total = $subtotal / $tax

so in this case

$total = 137 / 7.25%

then i round it off using the round function

[papaface]

[quote]but it really should be something like $9[/quote]
Are you sure you are correct?
Calculator even shows it as being 18.9...

[goatboy]

are you dividing?
i just did it in the windows calulator and on this sales tax calcualtr
http://www.convertit.com/Go/ConvertIt/Calculators/Finance/Sales_Tax_Calc.ASP

it comes out to 9.93

maybe i'm using a wrong formula but i'm pretty sure that's it

[mainewoods]

you get sales tax by multiplying not dividing:
[code]$tax = $price * .055;  //my state tax[/code]

[papaface]

You need to go:
[code]$total = $subtotal * $tax /100;[/code]

[mainewoods]

[code]$taxrate = .0725; //your tax rate expressed as a decimal
$total = $subtotal  + ($subtotal * $taxrate);[/code]

[goatboy]

i got it to work with dividing by /100
thanks guys!

for some reason the calculator and php give different answers when i did it the original way