-91.26% is the change from 915 to 80
Calculation steps:
[( 80 - 915 ) ÷ 915] x 100 = -91.26%
Formula
Percentage change = [(80 - 915) / 915] x 100
Subtract the new number by the original number
80 - 915 = -835
-835 ÷ 915 = -0.912568306010929
-0.912568306010929 x 100 = -91.26%