There is a menu contains fields: Item_id, Description, Rate, Quantity and Total.

=> Item_id contains 5 items.
=> rate and discription can be changed any time.

now Question is when i enter quantity it should display total (formula)
and suppose i choose 5 items and i enter quantities it shoud give me the total bill (Summary)

Which triggers I can use to accomplish this task. and suppose I change the rate and discription what will happen?

Question asked by visitor Manikumar