-57.25% is the change from 800 to 342
Calculation steps:
[( 342 - 800 ) ÷ 800] x 100 = -57.25%
Formula
Percentage change = [(342 - 800) / 800] x 100
Subtract the new number by the original number
342 - 800 = -458
-458 ÷ 800 = -0.5725
-0.5725 x 100 = -57.25%