4238.1% is the change from 21 to 911
Calculation steps:
[( 911 - 21 ) ÷ 21] x 100 = 4238.1%
Formula
Percentage change = [(911 - 21) / 21] x 100
Subtract the new number by the original number
911 - 21 = 890
890 ÷ 21 = 42.38095238095238
42.38095238095238 x 100 = 4238.1%