-57.13% is the change from 800 to 343
Calculation steps:
[( 343 - 800 ) ÷ 800] x 100 = -57.13%
Formula
Percentage change = [(343 - 800) / 800] x 100
Subtract the new number by the original number
343 - 800 = -457
-457 ÷ 800 = -0.57125
-0.57125 x 100 = -57.13%