-50.49% is the change from 103 to 51
Calculation steps:
[( 51 - 103 ) ÷ 103] x 100 = -50.49%
Formula
Percentage change = [(51 - 103) / 103] x 100
Subtract the new number by the original number
51 - 103 = -52
-52 ÷ 103 = -0.5048543689320388
-0.5048543689320388 x 100 = -50.49%