338.46% is the change from 91 to 399
Calculation steps:
[( 399 - 91 ) ÷ 91] x 100 = 338.46%
Formula
Percentage change = [(399 - 91) / 91] x 100
Subtract the new number by the original number
399 - 91 = 308
308 ÷ 91 = 3.3846153846153846
3.3846153846153846 x 100 = 338.46%