Need formula to calculate subtotal before sales tax

[HLR2007]

I have a spreadsheet showing a year's worth of invoices that have the
final totals listed, but I need a formula to show the subtotal before
the sales tax is added.

The example I am working from has me very frustrated, to say the
least. I feel REALLY dumb right about now!

Subtotal of Order = $253
Sales Tax = 8.75%
Final Total = $275.14

So, my year summary already shows the total ($275.14) and I need to
calculate and display the subtotal ($253). I know the subtotal in
this example because I went back and looked at the original invoice,
but I don't want to do that every time.

I won't even bother including my formulas, as I already know they are
wrong!

 

[David Hilberg]

Divide Total by 1.0875.

- David

 

[Guest]

HLR --

Howze about:

A B
1 $275.14 =A1/1.0875

seems to work. Answer is $253.0023

HTH

 

[joeu2004]

I have a spreadsheet showing a year's worth of invoices that have the
final totals listed, but I need a formula to show the subtotal before
the sales tax is added.
[....]
The example I am working from [....]
Subtotal of Order = $253
Sales Tax = 8.75%
Final Total = $275.14

Ostensibly, if the final total is in B3 and the sales tax rate in B2,
then subtotal in B1 can be computed by:

=round(B3/(1+B2), 2)

But I don't know if that will always reproduce the original subtotal
exactly. You see, originally the final total (B3) was computed
effectively by:

=B1 + round(B1*B2, 2)

But it seems to work for all the (random) numbers that I have tried.

 

[HLR2007]

A B
1 $275.14 =A1/1.0875

seems to work. Answer is $253.0023

HTH

This one works perfectly! Thanks so much.