Selecting if formulas based on column value

Hello,

I am trying to have multiple formulas used for different values entered.

I have a dropdown list column with the values of "AB" and "ON" in F14.

A user will enter a numeric value in E14 and I want it so that if E14 ONLY has the value of 1 or 2 the following formula will execute in G14

=IF(F14="AB",D14/1.04*0.04/2,IF(F14="ON",D14/1.12*0.12/2))

OR if E14 equals 3 then I want =IF(F14="AB", D14/1.04*0.04/2,IF(F14="ON",D14/1.12*0.12/2))