-29.96% is the change from 721 to 505
Calculation steps:
[( 505 - 721 ) ÷ 721] x 100 = -29.96%
Formula
Percentage change = [(505 - 721) / 721] x 100
Subtract the new number by the original number
505 - 721 = -216
-216 ÷ 721 = -0.29958391123439665
-0.29958391123439665 x 100 = -29.96%