Multiple Table addition calculations

I have a few tables each has similar structures with five columns. I want to add them to form new table. For example, 10% of table one add 20% table two and 70% table three to have a new table. The total percentage is 100%. I need to make many tables with all the possible variations.

I tried this:

for A=0:0.1:1, B=0:0.1:1, C=0:0.1:1, and A+B+C=1.0

R=T1.*A+T2.*B+T2.*C

%%T1, T2, and T3 are the tables%%%

end;

It did not work. Can someone help? Thank you.