97.8% is the change from 409 to 809
Calculation steps:
[( 809 - 409 ) ÷ 409] x 100 = 97.8%
Formula
Percentage change = [(809 - 409) / 409] x 100
Subtract the new number by the original number
809 - 409 = 400
400 ÷ 409 = 0.9779951100244498
0.9779951100244498 x 100 = 97.8%