9-7 =22折的价格为 80 + 70 =150 (元州谨枣册拆)所晌迅以原定价为 150 ÷ 0.2 = 750 (元)进价为 750 × 0.9 -80 = 595 (元)
(80+70)/(0.9-0.7)=750