-75% is the change from 860 to 215
Calculation steps:
[( 215 - 860 ) ÷ 860] x 100 = -75%
Formula
Percentage change = [(215 - 860) / 860] x 100
Subtract the new number by the original number
215 - 860 = -645
-645 ÷ 860 = -0.75
-0.75 x 100 = -75%
Example