Business Rules have been one of the greatest additions in Dynamics CRM, I just personally love them. Lately, there was a lot of feedback as to complex calculations were not possible using them.
The idea to do this calculation in Business Rule is to divide the equation into multiple parts with each part containing only single operation, my case looks like below
**Probable Value = Est. Revenue * Probability** **Probable Value = Probable Value / 100**
Hope you get the idea. This is how you should break your calculations and have only one operation per statement. It will also enable you to do any complex calculations as well. Possibilities are endless 🙂
See my Business Rule below