Our base price for chipped butea superba is 20 US dollar per 500 gram. Whenever the purchased quantity is the double of a previously doubled quantity, then the price is multiplied by 1.6. Thus, the levels at which discounts become effective are: 1 kg, 2 kg, 4 kg, 8 kg, 16 kg, 32 kg, and so on.
However, we do not ship round quantities for less than 64 kg, because these quantities are shipped by postal service. Shipping costs are a substantial portion of the overall costs; we therefore always stay below the weight limits at which there is a stark increase of postal charges. For example, we ship 1.95 kg instead of 2.1 kg. To arrive at an overall package weight of less than 2 kg (to stay with the example), the net amount of butea superba chips that we ship is 1.65 kg. For a quantity of 1.65 kg, the per-kilo price for 1 kg applies.
After computing quantities and prices of butea superba by the above rules, we just add the shipping, packaging, and handling costs which are different for airmail and surface mail.