| 摘要 |
A system for accounting an item sold by weight according to the present invention detects the weight of the item sold by weight taken in a package, calculates the sales price for the item sold by weight taken in the package based on the detected weight, and writes information on the detected weight and information on the calculated sales price in a recording unit provided on a tray for holding the package and from which data can be read and in which data can be written. Then, the system checks whether an unjust purchase is done for the item sold by weight before the system makes accounts square for the item sold by weight or before the system starts selling the item sold by weight by measuring the weight of the tray and checking whether the weight of the tray identified by the recorded information of the recording unit and the measured weight match or not.
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