an all-equity firm changes its capital structure: it borrows $10 and uses this amount to buy back stock. the initial number of shares is equal to 50. assuming a buyback price of $1 and a post-buyback firm value of $90, what is the post-buyback stock price? [round your final result to 1 decimal] group of answer choices $2.3 $2.0 $1.5 $0.5 $1.0