400.96% is the change from 104 to 521
Calculation steps:
[( 521 - 104 ) ÷ 104] x 100 = 400.96%
Formula
Percentage change = [(521 - 104) / 104] x 100
Subtract the new number by the original number
521 - 104 = 417
417 ÷ 104 = 4.009615384615385
4.009615384615385 x 100 = 400.96%