Suppose the Campus Bookstore purchases 50,000 boxes of writing tablets every year. Ordering costs are $100 per order and carrying costs are $0.40 per box. Moreover, management has determined that the EOQ is 5,000 boxes. The vendor now offers a quantity discount of $0.20 per box if the company buys tablets in order sizes of 10,000 boxes. Determine the before-tax benefit or loss of accepting the quantity discount. (Assume the carrying cost remains at $0.40 per box whether or not the discount is taken.)

How come this answer is 500 benefits?