Prices (Problem 8.1)
  Wash, dry & fold              4.50 kg            36000
  Wash, dry & fold              2.00 kg            24000
  Wash, dry & fold              4.02 kg            32160
  Ironing only                  3.35 kg            20100
  Curtain                       4.40 kg   pickup   76000
  Bed cover, any size           2.00 item pickup   80000
  Dry cleaning - suit 2 pieces  2.00 item pickup  130000
  Dry cleaning - shirt/blouse   5.00 item pickup  100000
  Shoes deep clean              1.50 pair          90000
Workflow (Problem 8.2)
  Queued   owing  25000 -> Finished
  Finished owing  25000 -> Collect Rp 25.000 before handing over the laundry.
  Finished owing      0 -> Departed
  Departed owing      0 -> This order has already left the shop.
