what will the offer price of these shares be if luther is selling 1million shares. please show all calculations

Luther Industries is in the process of selling shares of stock in an auction IPO. At the end of the bidding period, Luther's investment bank has received the following bids:75,000 Number of Shares Price ($) Bid $19.50 50,000 $19.25 25,000 $19.10 25,000 $19.00 100.000 $18.75 125,000 $18.50 75,000 $18.25 150.000 $18,00 240,000 $17.75 80.000 $17.50 125.000 $17.25 150,000 $17.00 100,000 $16.90 60,000 $16.75 80,000 $16.50 75.000 $16.25 200,000