Provide discount for more than 1 ordered product

Cannot find an *IF* function

calculation is A x $35-((A-1) x $10)
(A=number of product purchased, less $10 for the second, third ect...)

Calculation works fine unless ZERO are purchased and then the result is 10 (which is technically correct for the calculation but not correct for the form)

There is no *if* in the functions and I'm at a loss as to how to fix this....

To my understanding, you would like to have the total amount of the products being ordered to be less than $10.00 for each ordered product exceeding 1.

For example, the product costs $100 each. If a respondent ordered 1 product the cost would be $100. But if the user ordered 2 products, the total amount would only be $190 and it would be $280 for 3 products.

Can you confirm if that is correct so we can try to create a Demo form for you, please?

We will wait for your response.