30.63% is the change from 506 to 661
Calculation steps:
[( 661 - 506 ) ÷ 506] x 100 = 30.63%
Formula
Percentage change = [(661 - 506) / 506] x 100
Subtract the new number by the original number
661 - 506 = 155
155 ÷ 506 = 0.30632411067193677
0.30632411067193677 x 100 = 30.63%