21.78% is the change from 721 to 878
Calculation steps:
[( 878 - 721 ) ÷ 721] x 100 = 21.78%
Formula
Percentage change = [(878 - 721) / 721] x 100
Subtract the new number by the original number
878 - 721 = 157
157 ÷ 721 = 0.217753120665742
0.217753120665742 x 100 = 21.78%