1357.14% is the change from 21 to 306
Calculation steps:
[( 306 - 21 ) ÷ 21] x 100 = 1357.14%
Formula
Percentage change = [(306 - 21) / 21] x 100
Subtract the new number by the original number
306 - 21 = 285
285 ÷ 21 = 13.571428571428571
13.571428571428571 x 100 = 1357.14%