-2.17% is the change from 920 to 900
Calculation steps:
[( 900 - 920 ) ÷ 920] x 100 = -2.17%
Formula
Percentage change = [(900 - 920) / 920] x 100
Subtract the new number by the original number
900 - 920 = -20
-20 ÷ 920 = -0.021739130434782608
-0.021739130434782608 x 100 = -2.17%