How do I make a cell use different formulas based off of another cell's input?

Something like =IF(C2="w",1+(e2*10%),if(C2="L",1+(e2*8%),""))

If the choice is a binary choice (C2 will be w or L and nothing else), you could use the IF() function =1+e2*if(C2="w",0.1,0.08)

If there are more choices, you could continue to nest IF() functions, but I would usually prefer to build a lookup table, then refer to that with a lookup function. =1+e2*vlookup(c2,lookup_table,2) http://office.microsoft.com/en-us/ex...011.aspx?CTT=1

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