**Bucks**, Good afternoon.

Issues involving taxes are always complicated to understand.

This happens anywhere in the world.

Accept then, is an almost impossible thing.

*ha ha ha*
That's my opinion.

Returning to the main issue ...

If taxes are within the price so you do not have 100% of their price only.

You have 100% of their price

**PLUS** taxes.

In your case over 30%.

Therefore, its price is

**130%**.

So $10.00 is 130%

therefore:

10% of the price is $0.77

20% of the price is $1.54

Your actual price is $7.69

The formulas:
A1 = 10

B1 --> tax --> 30%

C1 --> TAX --> =A1/13*3

D1 --> Your REAL Price --> =A1-C1

Then...

TAX 10% --> =A1/13

TAX 20% --> =A1/13*2

Compoundig Final PRICE:

D1 --> Your price =$7.69

D2 --> Tax =30%

c3 --> FINAL price --> =D1*(1+D2)

Is that what you're looking for?

I hope it helps.

--

Belo Horizonte, Brasil.

**Marcílio Lobão**