-73.4% is the change from 188 to 50
Calculation steps:
[( 50 - 188 ) ÷ 188] x 100 = -73.4%
Formula
Percentage change = [(50 - 188) / 188] x 100
Subtract the new number by the original number
50 - 188 = -138
-138 ÷ 188 = -0.7340425531914894
-0.7340425531914894 x 100 = -73.4%