-9.92% is the change from 121 to 109
Calculation steps:
[( 109 - 121 ) ÷ 121] x 100 = -9.92%
Formula
Percentage change = [(109 - 121) / 121] x 100
Subtract the new number by the original number
109 - 121 = -12
-12 ÷ 121 = -0.09917355371900827
-0.09917355371900827 x 100 = -9.92%