macro when using 4 drop down

[anjalirpai]

I have a set of 4 formulas  if one drop down is selected it should automatically take the correct formula
can someone help pleaseSALARY TYPEFormula200-per-hour3.33 * column S225-per-hour3.75 * column SFixed Salary 2500025000/no of daysFixed Salary 300030000/no of days
Regards
A