21.7% is the change from 530 to 645
Calculation steps:
[( 645 - 530 ) ÷ 530] x 100 = 21.7%
Formula
Percentage change = [(645 - 530) / 530] x 100
Subtract the new number by the original number
645 - 530 = 115
115 ÷ 530 = 0.2169811320754717
0.2169811320754717 x 100 = 21.7%