-84.21% is the change from 342 to 54
Calculation steps:
[( 54 - 342 ) ÷ 342] x 100 = -84.21%
Formula
Percentage change = [(54 - 342) / 342] x 100
Subtract the new number by the original number
54 - 342 = -288
-288 ÷ 342 = -0.8421052631578947
-0.8421052631578947 x 100 = -84.21%