-76.74% is the change from 215 to 50
Calculation steps:
[( 50 - 215 ) ÷ 215] x 100 = -76.74%
Formula
Percentage change = [(50 - 215) / 215] x 100
Subtract the new number by the original number
50 - 215 = -165
-165 ÷ 215 = -0.7674418604651163
-0.7674418604651163 x 100 = -76.74%