-69.88% is the change from 820 to 247
Calculation steps:
[( 247 - 820 ) ÷ 820] x 100 = -69.88%
Formula
Percentage change = [(247 - 820) / 820] x 100
Subtract the new number by the original number
247 - 820 = -573
-573 ÷ 820 = -0.698780487804878
-0.698780487804878 x 100 = -69.88%