please help.

You founded a firm that currently has 10 million shares, of which you own 6 million. You are considering an IPO where you would sell 1 million shares for $15 each. If all of the shares sold are secondary, what is the maximum number of secondary shares you could sell and still retain more than 50% ownership of the firm? How much would the firm raise in that case? What is the maximum number of secondary shares you could sell and still retain more than 50% ownership of the firm? The maximum number of secondary shares you could sell is sshares. (Round to the nearest whole number.)