279.31% is the change from 145 to 550
Calculation steps:
[( 550 - 145 ) ÷ 145] x 100 = 279.31%
Formula
Percentage change = [(550 - 145) / 145] x 100
Subtract the new number by the original number
550 - 145 = 405
405 ÷ 145 = 2.793103448275862
2.793103448275862 x 100 = 279.31%