-26.7% is the change from 880 to 645
Calculation steps:
[( 645 - 880 ) ÷ 880] x 100 = -26.7%
Formula
Percentage change = [(645 - 880) / 880] x 100
Subtract the new number by the original number
645 - 880 = -235
-235 ÷ 880 = -0.26704545454545453
-0.26704545454545453 x 100 = -26.7%