-86.45% is the change from 155 to 21
Calculation steps:
[( 21 - 155 ) ÷ 155] x 100 = -86.45%
Formula
Percentage change = [(21 - 155) / 155] x 100
Subtract the new number by the original number
21 - 155 = -134
-134 ÷ 155 = -0.864516129032258
-0.864516129032258 x 100 = -86.45%