538.61% is the change from 101 to 645
Calculation steps:
[( 645 - 101 ) ÷ 101] x 100 = 538.61%
Formula
Percentage change = [(645 - 101) / 101] x 100
Subtract the new number by the original number
645 - 101 = 544
544 ÷ 101 = 5.3861386138613865
5.3861386138613865 x 100 = 538.61%