Compare Columns

Hello people,

I need help with a code does following:

loops through Column J and K
if the values are equal on the same row
select the Value in Column B and (same row) divided by the value in Column AB (same row) and present the new value -1 in the Column T

and if there is no value in column B after you find same value in J and K skip. that and continue loop

Could someone help me?

Thank you in advance