10.43% is the change from 815 to 900
Calculation steps:
[( 900 - 815 ) ÷ 815] x 100 = 10.43%
Formula
Percentage change = [(900 - 815) / 815] x 100
Subtract the new number by the original number
900 - 815 = 85
85 ÷ 815 = 0.10429447852760736
0.10429447852760736 x 100 = 10.43%