437.4% is the change from 123 to 661
Calculation steps:
[( 661 - 123 ) ÷ 123] x 100 = 437.4%
Formula
Percentage change = [(661 - 123) / 123] x 100
Subtract the new number by the original number
661 - 123 = 538
538 ÷ 123 = 4.373983739837398
4.373983739837398 x 100 = 437.4%