33.13% is the change from 640 to 852
Calculation steps:
[( 852 - 640 ) ÷ 640] x 100 = 33.13%
Formula
Percentage change = [(852 - 640) / 640] x 100
Subtract the new number by the original number
852 - 640 = 212
212 ÷ 640 = 0.33125
0.33125 x 100 = 33.13%