21.25% is the change from 800 to 970
Calculation steps:
[( 970 - 800 ) ÷ 800] x 100 = 21.25%
Formula
Percentage change = [(970 - 800) / 800] x 100
Subtract the new number by the original number
970 - 800 = 170
170 ÷ 800 = 0.2125
0.2125 x 100 = 21.25%