LYFT IPO was issued at $72/share. Before the IPO, Lyft had 240 million class A shares outstanding and wanted to issue additional 30 million class A shares. On top of that, Lyft gave its underwriters options to purchase another 5 million shares at $72 each. When Lyft stock price fell below the IPO price of $72, to support the stock price, up to how many shares the underwriters could buy from the open market without losing money