-19.04% is the change from 788 to 638
Calculation steps:
[( 638 - 788 ) ÷ 788] x 100 = -19.04%
Formula
Percentage change = [(638 - 788) / 788] x 100
Subtract the new number by the original number
638 - 788 = -150
-150 ÷ 788 = -0.19035532994923857
-0.19035532994923857 x 100 = -19.04%