209.39% is the change from 309 to 956
Calculation steps:
[( 956 - 309 ) ÷ 309] x 100 = 209.39%
Formula
Percentage change = [(956 - 309) / 309] x 100
Subtract the new number by the original number
956 - 309 = 647
647 ÷ 309 = 2.0938511326860842
2.0938511326860842 x 100 = 209.39%