367.78% is the change from 90 to 421
Calculation steps:
[( 421 - 90 ) ÷ 90] x 100 = 367.78%
Formula
Percentage change = [(421 - 90) / 90] x 100
Subtract the new number by the original number
421 - 90 = 331
331 ÷ 90 = 3.6777777777777776
3.6777777777777776 x 100 = 367.78%