-66.59% is the change from 820 to 274
Calculation steps:
[( 274 - 820 ) ÷ 820] x 100 = -66.59%
Formula
Percentage change = [(274 - 820) / 820] x 100
Subtract the new number by the original number
274 - 820 = -546
-546 ÷ 820 = -0.6658536585365854
-0.6658536585365854 x 100 = -66.59%