This is my second time uploading this question...the answer 85 packages is incorrect...could I please get the correct answer, that would be so greatly appreciated!

To boost sales, Pfisher announces a new price structure for disposable surgical packages. Although the price break no longer is available at 200 units, Pfisher now offers an even greater discount if larger quantities are purchased. On orders of 1 to 499 packages, the price is $50.25 per package. For orders of 500 or more, the price per unit is $47.80. Ordering costs, annual holding costs, and annual demand remain at $68 per order, 20 percent of the per-unit cost, and 510 packages per year, respectively. What is the new lot size? The new lot size is 85 packages. (Enter your response rounded to the nearest whole number.)