-33.06% is the change from 121 to 81
Calculation steps:
[( 81 - 121 ) ÷ 121] x 100 = -33.06%
Formula
Percentage change = [(81 - 121) / 121] x 100
Subtract the new number by the original number
81 - 121 = -40
-40 ÷ 121 = -0.3305785123966942
-0.3305785123966942 x 100 = -33.06%