19.63% is the change from 535 to 640
Calculation steps:
[( 640 - 535 ) ÷ 535] x 100 = 19.63%
Formula
Percentage change = [(640 - 535) / 535] x 100
Subtract the new number by the original number
640 - 535 = 105
105 ÷ 535 = 0.19626168224299065
0.19626168224299065 x 100 = 19.63%