1771.43% is the change from 21 to 393
Calculation steps:
[( 393 - 21 ) ÷ 21] x 100 = 1771.43%
Formula
Percentage change = [(393 - 21) / 21] x 100
Subtract the new number by the original number
393 - 21 = 372
372 ÷ 21 = 17.714285714285715
17.714285714285715 x 100 = 1771.43%