Cannot test code without data.
Cannot test code with macro variables without knowing what the values of the macro variables are.
The very first example for Proc Report in the online help shows how to add a summary line at the end of a report.
However anything called a "rate" is very likely not going to get a valid summary that way as the default summary is a SUM and Across variables complicate such. Rates typically need a numerator and denominator plus any other formula bits and to do a combined rate have to combine the individual numerators. Typical example: drive 1,000 miles and get a mileage rate of 1mpg, drive 1 mile and get 100mpg (lots of costing downhill perhaps) the average rate is not going to be (1+100)/2=50.5mpg.