3538.1% is the change from 21 to 764
Calculation steps:
[( 764 - 21 ) ÷ 21] x 100 = 3538.1%
Formula
Percentage change = [(764 - 21) / 21] x 100
Subtract the new number by the original number
764 - 21 = 743
743 ÷ 21 = 35.38095238095238
35.38095238095238 x 100 = 3538.1%