19.26% is the change from 815 to 972
Calculation steps:
[( 972 - 815 ) ÷ 815] x 100 = 19.26%
Formula
Percentage change = [(972 - 815) / 815] x 100
Subtract the new number by the original number
972 - 815 = 157
157 ÷ 815 = 0.19263803680981595
0.19263803680981595 x 100 = 19.26%