-69.05% is the change from 391 to 121
Calculation steps:
[( 121 - 391 ) ÷ 391] x 100 = -69.05%
Formula
Percentage change = [(121 - 391) / 391] x 100
Subtract the new number by the original number
121 - 391 = -270
-270 ÷ 391 = -0.690537084398977
-0.690537084398977 x 100 = -69.05%