Hi:
When PROC TABULATE calculates percents, it uses a formula that automatically includes the multiplication by 100 to make the percent. The PERCENT format also multiplies by 100. This means that you have too many places where the multiplication by 100 occurs when you use COLPCTSUM -with- a PERCENT format.
Most folks who use the "percent" statistics with PROC TABULATE (PCTN, PCTSUM, COLPCTN, COLPCTSUM, ROWPCTN, ROWPCTSUM, etc) either
--put a '%' into the column header for the percent and then leave the numbers without a percent sign OR,
--they use a picture format to append a percent sign to the percent calculated by TABULATE, as described here:
http://support.sas.com/kb/36/495.html
cynthia