DAX formula : count two filters and divide

Hi all,

I wish to sum together a COUNTROWS function and then divide it by the total number of rows.

Total % := DIVIDE(CALCULATE(COUNTROWS(Chron),Chron[Chron Band] = "Less than 90 days", Chron[Chron Band] = "No Chron and less than 60 days"), (COUNTROWS(Chron), 0 )

The data is under Chron Band column, I wish to count "Less than 90 days" + the count for "No Chron and less than 60 days" then to finally divide it by the total number of rows.

Solved :

Total % :=DIVIDE([Less than 60 days]+[No Chron and less than 60 days],COUNTROWS(Chron),0)

I had already made the Measures for the above but was over complicating things.