i am looking for formula, which can auto detect value in column A & B inputted manually and auto update value in column C once condition is triggered. Thank you. the example excel: https://docs.google.com/spreadsheets/d/1FJB6kSUnWnmxJ7VB0lAO_K88eWg8aZAaLN2KPx0uj14/edit?usp=sharing