I have two columns of numbers.
I need to write a formula to multiply the two columns together, and then add all of the products together.
In this case:
(16*1) + (6*0) + (4*0) + (4*0) + (4*0) + (2*0) = 16
Normally I would just make a third column to hold the products, and then sum those.
But this table is huge, and I would have to add way too many columns for that approach to be practical.