Multiple IF statements in Excel

Question

How can I do this in Excel with Multiple IF statements:-

The conditions:-

Answer 1

Here is how you'd write in for say, HIJ assuming by NULL you mean the value 0 and not empty cell:

=IF(C4>0,C4,IF(B4>0,B4,D4))

In layman's terms, If C4 is greater than 0, give me C4, if it's not then tell me if B4 is greater than 0, and if it is, give me B4, otherwise, just give me D4).