-66.02% is the change from 821 to 279
Calculation steps:
[( 279 - 821 ) ÷ 821] x 100 = -66.02%
Formula
Percentage change = [(279 - 821) / 821] x 100
Subtract the new number by the original number
279 - 821 = -542
-542 ÷ 821 = -0.6601705237515225
-0.6601705237515225 x 100 = -66.02%