if - chart function

[MJlassi]

Hello,

Can someone help with the below?

I have a simple table with multiple records,and to simplify it below a minimalist table whose operation is as follows

Saying I have the following data:

the desired result is as follows:

I would like to develop an expression that serves to reach the column 'EXP'

Thank you in advance for your help.

[Or]

The table does not make it clear what your operation should be... could you explain, in words or pseudo-code, what you're trying to achieve?

[sergio0592]

Hi, What is the rule for the EXP formula?