-69.57% is the change from 838 to 255
Calculation steps:
[( 255 - 838 ) ÷ 838] x 100 = -69.57%
Formula
Percentage change = [(255 - 838) / 838] x 100
Subtract the new number by the original number
255 - 838 = -583
-583 ÷ 838 = -0.6957040572792362
-0.6957040572792362 x 100 = -69.57%