41.06% is the change from 660 to 931
Calculation steps:
[( 931 - 660 ) ÷ 660] x 100 = 41.06%
Formula
Percentage change = [(931 - 660) / 660] x 100
Subtract the new number by the original number
931 - 660 = 271
271 ÷ 660 = 0.4106060606060606
0.4106060606060606 x 100 = 41.06%