9.2% is the change from 870 to 950
Calculation steps:
[( 950 - 870 ) ÷ 870] x 100 = 9.2%
Formula
Percentage change = [(950 - 870) / 870] x 100
Subtract the new number by the original number
950 - 870 = 80
80 ÷ 870 = 0.09195402298850575
0.09195402298850575 x 100 = 9.2%