Good day, 

Hoping someone can guide a newbie. I am using Zoho Invoice and estimate and would like to create the following custom fields and formula to show in the estimate and invoice 

Custome Fields;

Rate

US Price

Final Price

Rate * US Price = Final Price (2.5 * $100.00 = $250.00)

Then take the final price = Unit Price * QTY

Any help or guidance is greatly appreciated. 

Thanks

Rudy