-85.58% is the change from 312 to 45
Calculation steps:
[( 45 - 312 ) ÷ 312] x 100 = -85.58%
Formula
Percentage change = [(45 - 312) / 312] x 100
Subtract the new number by the original number
45 - 312 = -267
-267 ÷ 312 = -0.8557692307692307
-0.8557692307692307 x 100 = -85.58%