21.97% is the change from 669 to 816
Calculation steps:
[( 816 - 669 ) ÷ 669] x 100 = 21.97%
Formula
Percentage change = [(816 - 669) / 669] x 100
Subtract the new number by the original number
816 - 669 = 147
147 ÷ 669 = 0.21973094170403587
0.21973094170403587 x 100 = 21.97%