8.75% is the change from 800 to 870
Calculation steps:
[( 870 - 800 ) ÷ 800] x 100 = 8.75%
Formula
Percentage change = [(870 - 800) / 800] x 100
Subtract the new number by the original number
870 - 800 = 70
70 ÷ 800 = 0.0875
0.0875 x 100 = 8.75%
Example