【0302442】
A: (800+300+50)×1÷(1-15%)×15%
B: (800+300+50)×1×(1+5%)÷(1-15%)×15%
C: (800×2+300×2.5+50×2.5)×15%
D: (800×2+300×2.5+50×2)×15%