Make a cell do clever things in Excel

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Experience Level: Intermediate
I need a cell in Excel to do something unusual. Can it be done, I don't know??

I need it to reduce by 10% each week.

Eg someone types a number in the cell eg 80% on Wednesday (say).

For Thursday, Friday.........Monday Tuesday the cell continues to say 80%

BUT when the file is opened on the Wednesday it reduces to 70%. If someone then types 90% in the cell that is fine but the following Wednesday that goes down to 80%

If the cell is not touched then each wednesday it reduces by 10% until it gets to nothing.

The reason for the functionality is that my sales people put the potential of a client they have visited as a percentage 1% - unpromising 100% sure fire sale. I want them to be aware that potential erodes over time unless they do something about it.

I do not know if 10% is the correct amount so I would need to be able to change this.

It would be the icing on the cake if the cell went red when potential declined to 30% or less.

Must work in excel 2003 onwards.

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