3600% is the change from 21 to 777
Calculation steps:
[( 777 - 21 ) ÷ 21] x 100 = 3600%
Formula
Percentage change = [(777 - 21) / 21] x 100
Subtract the new number by the original number
777 - 21 = 756
756 ÷ 21 = 36
36 x 100 = 3600%
Example