Help with Last 3 Month Duplicate Check for Return Rate

Hello,

Please help a newbie here, I am trying to create a measure to calculate the number of duplicates in the last three months of the inputted data dates.

Basically what i need is the return rate and the formula is below

Duplicate ID + Failure = ID + Failure (two columns) that is present in the last month (lastdate) and also present in the last three months (based on lastdate - 3 months)

Total ID Count = Total number of ID in the last month

Return Rate = Duplicate ID + Failure ID Count / Total ID Count

Thanks in advance for the help