100.45% is the change from 449 to 900
Calculation steps:
[( 900 - 449 ) ÷ 449] x 100 = 100.45%
Formula
Percentage change = [(900 - 449) / 449] x 100
Subtract the new number by the original number
900 - 449 = 451
451 ÷ 449 = 1.0044543429844097
1.0044543429844097 x 100 = 100.45%