-57.98% is the change from 821 to 345
Calculation steps:
[( 345 - 821 ) ÷ 821] x 100 = -57.98%
Formula
Percentage change = [(345 - 821) / 821] x 100
Subtract the new number by the original number
345 - 821 = -476
-476 ÷ 821 = -0.5797807551766139
-0.5797807551766139 x 100 = -57.98%