How to calculate the export clothing quoted in dollars? It is best to provide a formula. thank you

For the factory:

FOB={{ 1-[ tax refund rate /( 1+ VAT rate)]} * RMB tax-included price}/spot foreign exchange buying price?

Formula analysis:?

FOB= (RMB tax-included price-tax refund income)/exchange rate?

In which: tax refund income = RMB tax-included price * [tax refund rate /( 1+ VAT rate)]?

Then:?

FOB={ RMB tax-inclusive price-{RMB tax-inclusive price * [tax rebate rate /( 1+ VAT rate)]}/exchange rate?

FOB={{ 1-[ tax refund rate /( 1+ VAT rate)]} * RMB tax-included price}/exchange rate?

For foreign trade companies:

FOB={{{ 1-[ tax refund rate /( 1+ VAT rate)]} * RMB tax-included purchase price}+profit}/spot purchase price?

Or:?

FOB={{ 1-[ Tax Refund Rate /( 1+ VAT Rate)]} * RMB purchase price including tax}/[Spot purchase price *( 1+ profit rate)]?