39.33% is the change from 661 to 921
Calculation steps:
[( 921 - 661 ) ÷ 661] x 100 = 39.33%
Formula
Percentage change = [(921 - 661) / 661] x 100
Subtract the new number by the original number
921 - 661 = 260
260 ÷ 661 = 0.39334341906202724
0.39334341906202724 x 100 = 39.33%