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Take below item as an example,
Actual number should be 23.55 and 5.114 ==> 23.55/5.114 = 4.60500 (up 360.5%)
Display number though is 24 and 5 which resulted in 24/5 = 4.8 (up 380%)
If you need 380% up as correct number, you need to round it not only display but also calculated field itself.
To jump onto what Shin wrote above, you could use the Round function in your calculation. Changing your calculation to be something like this:
(ROUND(Sales,1)-ROUND(Last Week Sales,1))/ROUND(Last Week Sales,1)
If you want to do anything fancy with rounding (Ceiling or floor rounding), here is a great post from James Dunkerley: Rounding Calculations in Tableau (and Excel and Alteryx) | James Dunkerley's Blog