28.94% is the change from 660 to 851
Calculation steps:
[( 851 - 660 ) ÷ 660] x 100 = 28.94%
Formula
Percentage change = [(851 - 660) / 660] x 100
Subtract the new number by the original number
851 - 660 = 191
191 ÷ 660 = 0.28939393939393937
0.28939393939393937 x 100 = 28.94%