I have an IF statement that needs to read

"New monthly rate going forward is $1,000.00"

My formula is

IF(ISBLANK( Custom_Description__c ),
"" ,
"New monthly rate going forward is" &""& Opportunity__r.Current_Monthly_Revenue__c)

but the Opportunity__r field is a currency field and the formula Error says "Incorrect parameter for function &(). Expected Text, received Number

Thank you in advance