5.25% is the change from 800 to 842
Calculation steps:
[( 842 - 800 ) ÷ 800] x 100 = 5.25%
Formula
Percentage change = [(842 - 800) / 800] x 100
Subtract the new number by the original number
842 - 800 = 42
42 ÷ 800 = 0.0525
0.0525 x 100 = 5.25%
Example