-6.49% is the change from 771 to 721
Calculation steps:
[( 721 - 771 ) ÷ 771] x 100 = -6.49%
Formula
Percentage change = [(721 - 771) / 771] x 100
Subtract the new number by the original number
721 - 771 = -50
-50 ÷ 771 = -0.0648508430609598
-0.0648508430609598 x 100 = -6.49%