-29.77% is the change from 487 to 342
Calculation steps:
[( 342 - 487 ) ÷ 487] x 100 = -29.77%
Formula
Percentage change = [(342 - 487) / 487] x 100
Subtract the new number by the original number
342 - 487 = -145
-145 ÷ 487 = -0.29774127310061604
-0.29774127310061604 x 100 = -29.77%