328.57% is the change from 21 to 90
Calculation steps:
[( 90 - 21 ) ÷ 21] x 100 = 328.57%
Formula
Percentage change = [(90 - 21) / 21] x 100
Subtract the new number by the original number
90 - 21 = 69
69 ÷ 21 = 3.2857142857142856
3.2857142857142856 x 100 = 328.57%