-9.62% is the change from 312 to 282
Calculation steps:
[( 282 - 312 ) ÷ 312] x 100 = -9.62%
Formula
Percentage change = [(282 - 312) / 312] x 100
Subtract the new number by the original number
282 - 312 = -30
-30 ÷ 312 = -0.09615384615384616
-0.09615384615384616 x 100 = -9.62%