428.4% is the change from 81 to 428
Calculation steps:
[( 428 - 81 ) ÷ 81] x 100 = 428.4%
Formula
Percentage change = [(428 - 81) / 81] x 100
Subtract the new number by the original number
428 - 81 = 347
347 ÷ 81 = 4.283950617283951
4.283950617283951 x 100 = 428.4%