29.1% is the change from 512 to 661
Calculation steps:
[( 661 - 512 ) ÷ 512] x 100 = 29.1%
Formula
Percentage change = [(661 - 512) / 512] x 100
Subtract the new number by the original number
661 - 512 = 149
149 ÷ 512 = 0.291015625
0.291015625 x 100 = 29.1%