Pricing for intermediate quantities is based on a calculation of the unit price based on the difference between the quantity prices either side.

For example, say the following prices were entered:

Quantity	Price
1,000	100.00
2,000	190.00
3,000	250.00
4,000	300.00

If the user entered a quantity of 2,500, the price would be calculated as follows:

Base price for 2,000: 190.00
Unit price for items for items between 2,000 and 3,000: 250 - 190 / 1,000 = 0.06
Final price: 190.00 + (0.06 * 500) = 220.00

Using a rate card with one option:

Quantity	Base Price	Option Price
100	60.00	12.00
500	300.00	24.00
1,000	750.00	45.00
5,000	3750.00	60.00

Ordering a quantity of 200 would be calculated in the following way:

Base price: 60.00 + (100 * (300.00 - 60.00)/(500 - 100)) = 120.00
Option Price: 12.00 + (100 * (24.00 - 12.00)/(500 - 100)) = 15.00
Total Price = 135.00

Ordering a quantity of 1050 would be:

Base price: 750.00 + (50 * (3750.00 - 750.00)/(5000 - 1000)) = 787.50
Option Price: 45.00 + (50 * (60.00 - 45.00)/(5000 - 1000)) = 45.19
Total Price = 832.69

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