-30.89% is the change from 492 to 340
Calculation steps:
[( 340 - 492 ) ÷ 492] x 100 = -30.89%
Formula
Percentage change = [(340 - 492) / 492] x 100
Subtract the new number by the original number
340 - 492 = -152
-152 ÷ 492 = -0.3089430894308943
-0.3089430894308943 x 100 = -30.89%