31.88% is the change from 505 to 666
Calculation steps:
[( 666 - 505 ) ÷ 505] x 100 = 31.88%
Formula
Percentage change = [(666 - 505) / 505] x 100
Subtract the new number by the original number
666 - 505 = 161
161 ÷ 505 = 0.3188118811881188
0.3188118811881188 x 100 = 31.88%