-6.58% is the change from 304 to 284
Calculation steps:
[( 284 - 304 ) ÷ 304] x 100 = -6.58%
Formula
Percentage change = [(284 - 304) / 304] x 100
Subtract the new number by the original number
284 - 304 = -20
-20 ÷ 304 = -0.06578947368421052
-0.06578947368421052 x 100 = -6.58%