-34.68% is the change from 770 to 503
Calculation steps:
[( 503 - 770 ) ÷ 770] x 100 = -34.68%
Formula
Percentage change = [(503 - 770) / 770] x 100
Subtract the new number by the original number
503 - 770 = -267
-267 ÷ 770 = -0.34675324675324676
-0.34675324675324676 x 100 = -34.68%