So your revenue as a function of x is going to be 10 times x. And since x is in thousands of pairs produced, if x is one, that means 1,000 pairs produced times 10, which means $10,000. But this will just give you 10. So this right over here is in thousands of dollars. Thousands of dollars. So if x is one, that means 1,000 pairs produced. 10 times one says r is equal to 10, but that really means $10,000.