銷貨收入 X
銷貨成本 30,000,000
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OI 2,160,000
銷貨成本=20,000*1,000+10,000,000=30,000,000
OI=12,000,000*18%= 2,160,000
銷貨收入=2,160,000+30,000,000=32,160,000
32,160,000/20,000=單位售價1,608
30,000,000*Y=32,160,000
Y=1.072