85.29% is the change from 340 to 630
Calculation steps:
[( 630 - 340 ) ÷ 340] x 100 = 85.29%
Formula
Percentage change = [(630 - 340) / 340] x 100
Subtract the new number by the original number
630 - 340 = 290
290 ÷ 340 = 0.8529411764705882
0.8529411764705882 x 100 = 85.29%