73.4% is the change from 391 to 678
Calculation steps:
[( 678 - 391 ) ÷ 391] x 100 = 73.4%
Formula
Percentage change = [(678 - 391) / 391] x 100
Subtract the new number by the original number
678 - 391 = 287
287 ÷ 391 = 0.7340153452685422
0.7340153452685422 x 100 = 73.4%