-1.79% is the change from 840 to 825
Calculation steps:
[( 825 - 840 ) ÷ 840] x 100 = -1.79%
Formula
Percentage change = [(825 - 840) / 840] x 100
Subtract the new number by the original number
825 - 840 = -15
-15 ÷ 840 = -0.017857142857142856
-0.017857142857142856 x 100 = -1.79%