344.44% is the change from 90 to 400
Calculation steps:
[( 400 - 90 ) ÷ 90] x 100 = 344.44%
Formula
Percentage change = [(400 - 90) / 90] x 100
Subtract the new number by the original number
400 - 90 = 310
310 ÷ 90 = 3.4444444444444446
3.4444444444444446 x 100 = 344.44%