-7.89% is the change from 912 to 840
Calculation steps:
[( 840 - 912 ) ÷ 912] x 100 = -7.89%
Formula
Percentage change = [(840 - 912) / 912] x 100
Subtract the new number by the original number
840 - 912 = -72
-72 ÷ 912 = -0.07894736842105263
-0.07894736842105263 x 100 = -7.89%