-50.12% is the change from 431 to 215
Calculation steps:
[( 215 - 431 ) ÷ 431] x 100 = -50.12%
Formula
Percentage change = [(215 - 431) / 431] x 100
Subtract the new number by the original number
215 - 431 = -216
-216 ÷ 431 = -0.5011600928074246
-0.5011600928074246 x 100 = -50.12%