-68.49% is the change from 857 to 270
Calculation steps:
[( 270 - 857 ) ÷ 857] x 100 = -68.49%
Formula
Percentage change = [(270 - 857) / 857] x 100
Subtract the new number by the original number
270 - 857 = -587
-587 ÷ 857 = -0.6849474912485414
-0.6849474912485414 x 100 = -68.49%