-31.75% is the change from 945 to 645
Calculation steps:
[( 645 - 945 ) ÷ 945] x 100 = -31.75%
Formula
Percentage change = [(645 - 945) / 945] x 100
Subtract the new number by the original number
645 - 945 = -300
-300 ÷ 945 = -0.31746031746031744
-0.31746031746031744 x 100 = -31.75%