90.94% is the change from 309 to 590
Calculation steps:
[( 590 - 309 ) ÷ 309] x 100 = 90.94%
Formula
Percentage change = [(590 - 309) / 309] x 100
Subtract the new number by the original number
590 - 309 = 281
281 ÷ 309 = 0.9093851132686084
0.9093851132686084 x 100 = 90.94%