-8.42% is the change from 915 to 838
Calculation steps:
[( 838 - 915 ) ÷ 915] x 100 = -8.42%
Formula
Percentage change = [(838 - 915) / 915] x 100
Subtract the new number by the original number
838 - 915 = -77
-77 ÷ 915 = -0.08415300546448087
-0.08415300546448087 x 100 = -8.42%