27.08% is the change from 661 to 840
Calculation steps:
[( 840 - 661 ) ÷ 661] x 100 = 27.08%
Formula
Percentage change = [(840 - 661) / 661] x 100
Subtract the new number by the original number
840 - 661 = 179
179 ÷ 661 = 0.2708018154311649
0.2708018154311649 x 100 = 27.08%