Problem description & analysis:

Here below is a data table:

Task: We want to calculate the price value in column B according to the quantity in column A, and the calculation should follow the rule: different quantity intervals correspond to different prices, as shown in the table below:

Solution:

Use SPL XLL and enter in cell B2:

=spl("=[15,13.75,13,12.5]([30,50,100,300,500].pseg@r(?1))",A2)

The result is as follows:

Then drag B2 down to every relevant row:

The idea of the calculation is to use the pseg function to calculate which interval the quantity value belongs to [30, 50, 100, 300, 500], and then take out the price of the corresponding interval from the price sequence [15, 13.75, 13, 12.5] and return.

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