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Hi Justine
I am Dave, I will help you with this.
In Excel it is best to think of percentages as Decimal values, where 1.00 is 100%, 0.50 is 50%... and so on.
So, to add 4% to a number, multiply by 1.04 to get 104%, you can use this formula and drag downwards in that column.
=H2 * 1.04