19.75% is the change from 400 to 479
Calculation steps:
[( 479 - 400 ) ÷ 400] x 100 = 19.75%
Formula
Percentage change = [(479 - 400) / 400] x 100
Subtract the new number by the original number
479 - 400 = 79
79 ÷ 400 = 0.1975
0.1975 x 100 = 19.75%
Example