-68.92% is the change from 827 to 257
Calculation steps:
[( 257 - 827 ) ÷ 827] x 100 = -68.92%
Formula
Percentage change = [(257 - 827) / 827] x 100
Subtract the new number by the original number
257 - 827 = -570
-570 ÷ 827 = -0.6892382103990327
-0.6892382103990327 x 100 = -68.92%