1361.9% is the change from 21 to 307
Calculation steps:
[( 307 - 21 ) ÷ 21] x 100 = 1361.9%
Formula
Percentage change = [(307 - 21) / 21] x 100
Subtract the new number by the original number
307 - 21 = 286
286 ÷ 21 = 13.619047619047619
13.619047619047619 x 100 = 1361.9%