48.89% is the change from 450 to 670
Calculation steps:
[( 670 - 450 ) ÷ 450] x 100 = 48.89%
Formula
Percentage change = [(670 - 450) / 450] x 100
Subtract the new number by the original number
670 - 450 = 220
220 ÷ 450 = 0.4888888888888889
0.4888888888888889 x 100 = 48.89%