Question

How many potatoes are you going to buy. where do i put a comma

Answer 1

It doesn't need one

Step-by-step explanation:

Also instead of a period, it needs to be a question mark

Answer 2

Your not supposed to add a comma in this sentence. lol

Step-by-step explanation:

Check your punctuation, though.

How many potatoes are you going to buy?

That's better.