How to provide instant quotes

Hello! I have a simple price sheet for my tshirt shop store in a google spreadsheet. I would like to be able to provide an instant quote at the end of the form based on the quantity of shirts someone inputs. How would I do this. Thanks in advance!

Hello there! You can refer to this link on how to integrate google sheets to your form: Google Sheets Integration | Feathery
You can do that to send data to your sheet and then utilize an API call again to get your result (sample use of API call to google sheet: Pre-fill field options from Google Sheets | Feathery Docs )