Oki ES5442 Advanced Manual page 154

The default value for each paper size point is calculated based on the area ratio of the paper to A4 paper.
6
Enter the setting value and click [Submit].
7
Close the setting screen.
8
Click [Duplex Printing Discount Settings] or [Toner Saving Discount Rate
Settings(OnlyWhen Toner Saving Calculation Setting is Enable)].
The setting screen opens separately.
9
Enter the setting value and click [Submit].
10
Close the setting screen.
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5. Operating Management/ Specifications