-83.47% is the change from 121 to 20
Calculation steps:
[( 20 - 121 ) ÷ 121] x 100 = -83.47%
Formula
Percentage change = [(20 - 121) / 121] x 100
Subtract the new number by the original number
20 - 121 = -101
-101 ÷ 121 = -0.8347107438016529
-0.8347107438016529 x 100 = -83.47%