24.21% is the change from 661 to 821
Calculation steps:
[( 821 - 661 ) ÷ 661] x 100 = 24.21%
Formula
Percentage change = [(821 - 661) / 661] x 100
Subtract the new number by the original number
821 - 661 = 160
160 ÷ 661 = 0.24205748865355523
0.24205748865355523 x 100 = 24.21%