117.39% is the change from 391 to 850
Calculation steps:
[( 850 - 391 ) ÷ 391] x 100 = 117.39%
Formula
Percentage change = [(850 - 391) / 391] x 100
Subtract the new number by the original number
850 - 391 = 459
459 ÷ 391 = 1.173913043478261
1.173913043478261 x 100 = 117.39%