20.12% is the change from 666 to 800
Calculation steps:
[( 800 - 666 ) ÷ 666] x 100 = 20.12%
Formula
Percentage change = [(800 - 666) / 666] x 100
Subtract the new number by the original number
800 - 666 = 134
134 ÷ 666 = 0.2012012012012012
0.2012012012012012 x 100 = 20.12%