Enter a value and for it to become a percentage of another cell

[mistrellis]

Pretty much what it says on the tin.

A1 = 200
I am going to enter 50 into cell B1. After i lose focus on B1 the 50 turns into a percentage of A1 ie: 25%

Or do I just double up my columns one for the 50 one for the calc ?
Then hide my figure column.

 

[sheetspread]

do I just double up my columns one for the 50 one for the calc ?
Then hide my figure column.

That's the better way to do it even if the single cell method (requiring VBA) looks cool.