Question mark or period to end a rhetorical sentence

Solution 1:

That particular sentence could be a question or a statement. The use of a question mark or period is what would actually determine that.

Correct:

Maybe you could be a security guard there and enforce whatever the WalMart policy is at that location.

Also correct:

Maybe you could be a security guard there and enforce whatever the WalMart policy is at that location?

Solution 2:

You would use a period at the end:

Maybe you could be a security guard there and enforce whatever the WalMart policy is at that location.

If we rewrote it as a question, then we could use a question mark:

Could you be a security guard there and enforce whatever the WalMart policy is at that location?