-58.8% is the change from 830 to 342
Calculation steps:
[( 342 - 830 ) ÷ 830] x 100 = -58.8%
Formula
Percentage change = [(342 - 830) / 830] x 100
Subtract the new number by the original number
342 - 830 = -488
-488 ÷ 830 = -0.5879518072289157
-0.5879518072289157 x 100 = -58.8%