由題意得
1.5x×0.9-x>45,①
1.5x×0.9-x-
60 |
a |
x≤200,③
1.5x×0.9×a≥1000,④
由①③得129<x≤200,⑤
當(dāng)a=1時(shí),解②得x=
2700 |
7 |
當(dāng)a=2時(shí),解②得x=
1500 |
7 |
當(dāng)a=3時(shí),解②得x=
1300 |
7 |
當(dāng)a=4時(shí),解②得x=
1200 |
7 |
當(dāng)a=5時(shí),解②得x=
1140 |
7 |
當(dāng)a=6時(shí),解②得x=
1100 |
7 |
當(dāng)a=7時(shí),解②得x=
7500 |
49 |
當(dāng)a=8時(shí),解②得x=150符合④.
故選A.