-69.15% is the change from 833 to 257
Calculation steps:
[( 257 - 833 ) ÷ 833] x 100 = -69.15%
Formula
Percentage change = [(257 - 833) / 833] x 100
Subtract the new number by the original number
257 - 833 = -576
-576 ÷ 833 = -0.6914765906362546
-0.6914765906362546 x 100 = -69.15%