135.95% is the change from 420 to 991
Calculation steps:
[( 991 - 420 ) ÷ 420] x 100 = 135.95%
Formula
Percentage change = [(991 - 420) / 420] x 100
Subtract the new number by the original number
991 - 420 = 571
571 ÷ 420 = 1.3595238095238096
1.3595238095238096 x 100 = 135.95%