-51.96% is the change from 102 to 49
Calculation steps:
[( 49 - 102 ) ÷ 102] x 100 = -51.96%
Formula
Percentage change = [(49 - 102) / 102] x 100
Subtract the new number by the original number
49 - 102 = -53
-53 ÷ 102 = -0.5196078431372549
-0.5196078431372549 x 100 = -51.96%