1757.14% is the change from 21 to 390
Calculation steps:
[( 390 - 21 ) ÷ 21] x 100 = 1757.14%
Formula
Percentage change = [(390 - 21) / 21] x 100
Subtract the new number by the original number
390 - 21 = 369
369 ÷ 21 = 17.571428571428573
17.571428571428573 x 100 = 1757.14%