Are the following sentences natural to a native ear?
1. What is the rate for sales of cattle in Saudi Arabia?
2. The hygiene tests are applied at which level of the processing? At which level in the processing are the hygiene tests applied? (which one is more common and accurate in conversations?)
3. That was your test . ( I said this to a junior person at work. I had left an error in a calculation to check if she catches it, and she caught it)