统计各商家结算净收入与平台佣金

solve()

Merchant net income:
  绿茶餐厅外卖: gross=3420.3 fee=273.62 net=3146.68
  品质汉堡: gross=2334.9 fee=186.79 net=2148.11
  西北风味羊肉: gross=2166.0 fee=173.28 net=1992.72
  寿司去哪了: gross=2025.2 fee=162.02 net=1863.18
  麻辣香锅王: gross=1572.2 fee=125.78 net=1446.42
  重庆火锅外卖: gross=1515.2 fee=121.22 net=1393.98
  精品咖啡外卖: gross=1230.3 fee=98.42 net=1131.88
  健康轻食工坊: gross=1111.1 fee=88.89 net=1022.21
  港式茶餐厅: gross=1038.5 fee=83.08 net=955.42
  云南米线馆: gross=781.9 fee=62.55 net=719.35
  韩式炸鸡: gross=759.2 fee=60.74 net=698.46
  正宗兰州拉面: gross=743.9 fee=59.51 net=684.39
  老北京炸酱面: gross=590.3 fee=47.22 net=543.08
  沙县小吃总店: gross=547.3 fee=43.78 net=503.52
  湘味炒饭: gross=345.2 fee=27.62 net=317.58