Consider a company with an average order size of 3000, considered to be uniformly distributed between 2000 and 4000. Suppose that we wish to optimise expected cost and that the cost of under-ordering is $120 per unit. If the optimal order size is calculated to be 2500, then what is the cost (in dollars) of over-ordering per unit? State your answer to the nearest dollar (but do not include a dollar sign or any unit of currency).