-90.97% is the change from 310 to 28
Calculation steps:
[( 28 - 310 ) ÷ 310] x 100 = -90.97%
Formula
Percentage change = [(28 - 310) / 310] x 100
Subtract the new number by the original number
28 - 310 = -282
-282 ÷ 310 = -0.9096774193548387
-0.9096774193548387 x 100 = -90.97%