31.23% is the change from 506 to 664
Calculation steps:
[( 664 - 506 ) ÷ 506] x 100 = 31.23%
Formula
Percentage change = [(664 - 506) / 506] x 100
Subtract the new number by the original number
664 - 506 = 158
158 ÷ 506 = 0.31225296442687744
0.31225296442687744 x 100 = 31.23%