Based on the amount that X-Mart purchased, and the date they paid, the discount taken would be $8.
The terms are 2/10,n/30 which means that if X-Mart pays within 10 days, they would get a 2% discount.
They paid on the 11th which is 6 days later so they will get the 2% discount of:
= 2% x 400
= $8
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