-30.3% is the change from 495 to 345
Calculation steps:
[( 345 - 495 ) ÷ 495] x 100 = -30.3%
Formula
Percentage change = [(345 - 495) / 495] x 100
Subtract the new number by the original number
345 - 495 = -150
-150 ÷ 495 = -0.30303030303030304
-0.30303030303030304 x 100 = -30.3%