-60% is the change from 215 to 86
Calculation steps:
[( 86 - 215 ) ÷ 215] x 100 = -60%
Formula
Percentage change = [(86 - 215) / 215] x 100
Subtract the new number by the original number
86 - 215 = -129
-129 ÷ 215 = -0.6
-0.6 x 100 = -60%
Example