-66.34% is the change from 820 to 276
Calculation steps:
[( 276 - 820 ) ÷ 820] x 100 = -66.34%
Formula
Percentage change = [(276 - 820) / 820] x 100
Subtract the new number by the original number
276 - 820 = -544
-544 ÷ 820 = -0.6634146341463415
-0.6634146341463415 x 100 = -66.34%