-28.7% is the change from 770 to 549
Calculation steps:
[( 549 - 770 ) ÷ 770] x 100 = -28.7%
Formula
Percentage change = [(549 - 770) / 770] x 100
Subtract the new number by the original number
549 - 770 = -221
-221 ÷ 770 = -0.287012987012987
-0.287012987012987 x 100 = -28.7%