The base price of 1:50 extract is 240 USD for 500 grams. Whenever the purchased quantity is the double of a previous or previously-doubled quantity, then the price is multiplied by 1.8. Thus, the levels at which discounts become effective are: 1 kg, 2 kg, 4 kg, 8 kg, 16 kg, 32 kg, and so on.

1 kg - 240 x 1.8 = 432 USD

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2 kg - 432 x 1.8 = 777.6 USD
777.6 USD / 2 = 388.8 USD per kilo

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4 kg - 777.6 x 1.8 = 1,399.68 USD
1399.68 USD / 4 = 349.92 USD per kilo

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8 kg - 1,399.68 x 1.8 = 2519.42 USD
2519.42 / 8 = 314.93 USD per kilo

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16 kg - 2519.42 x 1.8 = 4534.96 USD
4534.96 USD / 16 = 283.44 USD per kilo

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32 kg - 4534.96 x 1.8 = 8162.93 USD
8162.93 USD / 32 = 255.09 USD per kilo

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64 kg - 8162.93 x 1.8 = 14693.28 USD
14693.28/ 64 = 229.58 USD per kilo

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128 kg - 14693.28 x 1.8 = 26447.91 USD
26447.91 USD / 128 = 206.62 USD per kilo

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256 kg - 26447.91 x 1.8 = 47606.23 USD
47606.23 USD / 256 = 185.96 USD per kilo

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512 kg - 47606.23 x 1.8 = 85691.21 USD
85691.21 USD / 512 = 167.36 USD per kilo