I have a small Rails application I'm creating.
I have for example a field called "sales_result".
I also have another two fields, namely, "price" and "quantity_sold".
I have the following formula:
sales_result = price * quantity_sold
How can I perform this formula in my rails application? Such that, when
I for example enter the following values:
price = 3.0
quantity_sold = 3
I get this result calculated automatically for "sales_result":
sales_result = 9
Where should I start in the Rails application in performing this