-41.18% is the change from 85 to 50
Calculation steps:
[( 50 - 85 ) ÷ 85] x 100 = -41.18%
Formula
Percentage change = [(50 - 85) / 85] x 100
Subtract the new number by the original number
50 - 85 = -35
-35 ÷ 85 = -0.4117647058823529
-0.4117647058823529 x 100 = -41.18%