-12.3% is the change from 821 to 720
Calculation steps:
[( 720 - 821 ) ÷ 821] x 100 = -12.3%
Formula
Percentage change = [(720 - 821) / 821] x 100
Subtract the new number by the original number
720 - 821 = -101
-101 ÷ 821 = -0.12302070645554203
-0.12302070645554203 x 100 = -12.3%