Would like to add "increase by %" column

Hi!

I'd like to make it easy for someone to enter a percentage value in a cell to increase a cell in another column.

Of course, when I try to enter a formula, not only do I obliterate the original cell value, but I get a circular reference, because I want to base the % increase on the Sum of the column I want add the % change to.

Any suggestions on how to lay this out / use a formula to make it easy as possible for someone just to add and number in the % change column and have all the other numbers change?

Example attached

Thank you!