321.23% is the change from 146 to 615
Calculation steps:
[( 615 - 146 ) ÷ 146] x 100 = 321.23%
Formula
Percentage change = [(615 - 146) / 146] x 100
Subtract the new number by the original number
615 - 146 = 469
469 ÷ 146 = 3.212328767123288
3.212328767123288 x 100 = 321.23%