How to use variables in newly-inserted columns?

Hi. Your help is needed. I have two kind of columns in my range. Original columns (a, b, c) and newly-inserted columns just to the right of each of the original (ai, bi, ci). The value (of any cell) of each newly-inserted column is the value of original column divided always by the second column (denoted p). Due to the DB size, I'm trying to use variables, but it having problems.

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Ok, apparently the code is working now. The reason I thought otherwise caused by the fact the constant divider (denoted as p) is a rather large number (something like 800,000) so many cells throughout my range shown like 0.0000 but actually were not null but rather small, like 0.00001 for example. Anyway it works, and it looks like a rather simple yet powerful loop if one needs to solve similar tasks.