328.57% is the change from 91 to 390
Calculation steps:
[( 390 - 91 ) ÷ 91] x 100 = 328.57%
Formula
Percentage change = [(390 - 91) / 91] x 100
Subtract the new number by the original number
390 - 91 = 299
299 ÷ 91 = 3.2857142857142856
3.2857142857142856 x 100 = 328.57%