67.67% is the change from 399 to 669
Calculation steps:
[( 669 - 399 ) ÷ 399] x 100 = 67.67%
Formula
Percentage change = [(669 - 399) / 399] x 100
Subtract the new number by the original number
669 - 399 = 270
270 ÷ 399 = 0.6766917293233082
0.6766917293233082 x 100 = 67.67%