caption: a toc calculates the discount of the quantity of the item
exif: {"Image DocumentName": "All Units Discount Schedule", "Image ImageDescription": "To determine the optimal order quantity, the total purchase cost must be included. TC(Q) = (Q/2)Ch + (D/Q)Co + DCi + ChSS. Ci represents the unit cost at the ith pricing level.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}