-60.09% is the change from 857 to 342
Calculation steps:
[( 342 - 857 ) ÷ 857] x 100 = -60.09%
Formula
Percentage change = [(342 - 857) / 857] x 100
Subtract the new number by the original number
342 - 857 = -515
-515 ÷ 857 = -0.6009334889148191
-0.6009334889148191 x 100 = -60.09%