21.47% is the change from 815 to 990
Calculation steps:
[( 990 - 815 ) ÷ 815] x 100 = 21.47%
Formula
Percentage change = [(990 - 815) / 815] x 100
Subtract the new number by the original number
990 - 815 = 175
175 ÷ 815 = 0.2147239263803681
0.2147239263803681 x 100 = 21.47%