69.92% is the change from 399 to 678
Calculation steps:
[( 678 - 399 ) ÷ 399] x 100 = 69.92%
Formula
Percentage change = [(678 - 399) / 399] x 100
Subtract the new number by the original number
678 - 399 = 279
279 ÷ 399 = 0.6992481203007519
0.6992481203007519 x 100 = 69.92%