31.62% is the change from 506 to 666
Calculation steps:
[( 666 - 506 ) ÷ 506] x 100 = 31.62%
Formula
Percentage change = [(666 - 506) / 506] x 100
Subtract the new number by the original number
666 - 506 = 160
160 ÷ 506 = 0.31620553359683795
0.31620553359683795 x 100 = 31.62%