-91.5% is the change from 1000 to 85
Calculation steps:
[( 85 - 1000 ) ÷ 1000] x 100 = -91.5%
Formula
Percentage change = [(85 - 1000) / 1000] x 100
Subtract the new number by the original number
85 - 1000 = -915
-915 ÷ 1000 = -0.915
-0.915 x 100 = -91.5%