6400% is the change from 7 to 455
Calculation steps:
[( 455 - 7 ) ÷ 7] x 100 = 6400%
Formula
Percentage change = [(455 - 7) / 7] x 100
Subtract the new number by the original number
455 - 7 = 448
448 ÷ 7 = 64
64 x 100 = 6400%
Example