So far I have used three elements:
1. drop down menu for the first rule, I give it an id X, the three option with value of 1, 2, 3
2. drop down menu for the second rule, I give it an id Y, the three option with value of 1, 2, 3
3. output: I give it an id C, the formula I use is: IF X=1 and Y=1 then $80, IF X=1 and Y =2 then $130……..
Can anybody teach me how to do this job?