4855% is the change from 20 to 991
Calculation steps:
[( 991 - 20 ) ÷ 20] x 100 = 4855%
Formula
Percentage change = [(991 - 20) / 20] x 100
Subtract the new number by the original number
991 - 20 = 971
971 ÷ 20 = 48.55
48.55 x 100 = 4855%
Example