Hello, 

My trailhead wont let be beat this challenge. I says:

"Challenge Not yet complete... here's what's wrong: 
The 'Opportunity_Progress__c' formula field does not exist or is not of type 'Number'"

Heres my code:

IF( Percent_Completed__c <=  0.25, "Early", IF( Percent_Completed__c  <= 0.75, "Middle", "Late" ) )

(TODAY() -DATEVALUE(CreatedDate))/ (CloseDate-DATEVALUE(CreatedDate))

What am I doing wrong? The top formula outputs as text, bottom one is a percent

Thank you for help!