[Grammar] Purchase vs. Purchased

[jocelynl]

1. Quantity purchase per transaction.
2. Quantity purchased per transaction.
3. Quantity purchasing per transaction.

Which one is correct?

I'm writing a company order form, and at the bottom I'm suppose to write something that says we give discounts for larger quantity orders on the same transaction.

Can anyone help me?

 

[Gillnetter]

1. Quantity purchase per transaction.
2. Quantity purchased per transaction.
3. Quantity purchasing per transaction.

Which one is correct?
There is no mention of the discount.
A quantity purchase of more then ___ per transaction will receive a discount of $__, or, __%.

I'm writing a company order form, and at the bottom I'm suppose to write something that says we give discounts for larger quantity orders on the same transaction.

Can anyone help me?

In many businesses the amount of the discount is dependent upon the number of items purchased. For example, if you buy 10 of my rugs, you will receive a 15% discount. If you buy more then 30 rugs, you will receive a 20% discount.