課關稅前,PW = 3代入,QD =16、QS =4,進口=16-4=12
課關稅後,P = 5代入,QD =12、QS =6,進口=12-6=6
消費者剩餘=(11-5)*12/2-(11-3)*16/2=-28 或是-(12+16)*(5-3)/2
生產者剩餘=(4+6)*(5-3)/2=10