-15.7% is the change from 121 to 102
Calculation steps:
[( 102 - 121 ) ÷ 121] x 100 = -15.7%
Formula
Percentage change = [(102 - 121) / 121] x 100
Subtract the new number by the original number
102 - 121 = -19
-19 ÷ 121 = -0.15702479338842976
-0.15702479338842976 x 100 = -15.7%