7.93% is the change from 593 to 640
Calculation steps:
[( 640 - 593 ) ÷ 593] x 100 = 7.93%
Formula
Percentage change = [(640 - 593) / 593] x 100
Subtract the new number by the original number
640 - 593 = 47
47 ÷ 593 = 0.07925801011804384
0.07925801011804384 x 100 = 7.93%