643.8% is the change from 121 to 900
Calculation steps:
[( 900 - 121 ) ÷ 121] x 100 = 643.8%
Formula
Percentage change = [(900 - 121) / 121] x 100
Subtract the new number by the original number
900 - 121 = 779
779 ÷ 121 = 6.43801652892562
6.43801652892562 x 100 = 643.8%