-60.47% is the change from 860 to 340
Calculation steps:
[( 340 - 860 ) ÷ 860] x 100 = -60.47%
Formula
Percentage change = [(340 - 860) / 860] x 100
Subtract the new number by the original number
340 - 860 = -520
-520 ÷ 860 = -0.6046511627906976
-0.6046511627906976 x 100 = -60.47%