28.01% is the change from 664 to 850
Calculation steps:
[( 850 - 664 ) ÷ 664] x 100 = 28.01%
Formula
Percentage change = [(850 - 664) / 664] x 100
Subtract the new number by the original number
850 - 664 = 186
186 ÷ 664 = 0.28012048192771083
0.28012048192771083 x 100 = 28.01%