-90.38% is the change from 312 to 30
Calculation steps:
[( 30 - 312 ) ÷ 312] x 100 = -90.38%
Formula
Percentage change = [(30 - 312) / 312] x 100
Subtract the new number by the original number
30 - 312 = -282
-282 ÷ 312 = -0.9038461538461539
-0.9038461538461539 x 100 = -90.38%