1.23% is the change from 815 to 825
Calculation steps:
[( 825 - 815 ) ÷ 815] x 100 = 1.23%
Formula
Percentage change = [(825 - 815) / 815] x 100
Subtract the new number by the original number
825 - 815 = 10
10 ÷ 815 = 0.012269938650306749
0.012269938650306749 x 100 = 1.23%