Hey,

Let me explain exactly what I am looking for here.

I need a formula that will help me to determine the amount of items a person needs to reach a target percentage.

Let's relate it to sales calls. A person needs to have a certain percentage of sales at the end of month, if they are at 15 sales right now and have 100 calls, obviously at 15%. Let's say their target goal is 20%. How can I calculate how many more calls they would need to reach 20%?

The only things I have been able to find don't take into account that the fact that the total number of calls increases as well.