Parameter Multiplier Forecast Model in BI

Hi,

I am working with a report containing student data. Some of the students have graduated, some are still pending graduation. The pending students are reflected in a column titled "Anticipated Completion". This column counts all students that are expected to graduate. I am trying to build a forecast slicer that would give the end user the ability to calculate number of students who actually graduate if we expect 100% of anticipated completions to graduate, vs 80%, etc. I've used a parameter with a numeric value but the end user doesn't really see it. I've set a parameter "Anticipated Completion projection" to 100, which means that we expect 100% of all the students in the "Anticipated Completion" column to graduate. Is there a way to make this dynamic? And have the "Anticipated Completion" column values update as this number updates (currently I created another column that calculates the value in "Anticipated completion" * "Anticipated Completion projection" parameter/100? Also, can I somehow make this visible to the end user? Thank you so much for all the help!