49.11% is the change from 450 to 671
Calculation steps:
[( 671 - 450 ) ÷ 450] x 100 = 49.11%
Formula
Percentage change = [(671 - 450) / 450] x 100
Subtract the new number by the original number
671 - 450 = 221
221 ÷ 450 = 0.4911111111111111
0.4911111111111111 x 100 = 49.11%