19.02% is the change from 815 to 970
Calculation steps:
[( 970 - 815 ) ÷ 815] x 100 = 19.02%
Formula
Percentage change = [(970 - 815) / 815] x 100
Subtract the new number by the original number
970 - 815 = 155
155 ÷ 815 = 0.1901840490797546
0.1901840490797546 x 100 = 19.02%