I am a bit new to Excel 2007 and I am trying to figure out how to create a formula to add 7 to the previous number if the number in the tens place is not the same as the previous number in the tens place. If it is then add 17 to the code. Here is a sample number pattern:
I am entering a ton of certified mail tickets and seems the last four of the ticket number has this pattern. Knowing a formula to autofill would save me a ton of time.
I have attached a sample spreadhsheet. I could easily code a formula to add seven but get stuck when I try to if logic to check the tens place.