1. Some items were sold at a 50%
discount.
2. Some items were sold at a 50%
off.
3. Some items were 50% discount.
4. Some items were 50% off.
================
Are they all grammatical?
discount.
2. Some items were sold at a 50%
off.
3. Some items were 50% discount.
4. Some items were 50% off.
================
Are they all grammatical?