Answer:
$6 is the stock price of Firm B.
Step-by-step explanation:
In a perfect competition under MM approach the value of an unlevered firm and value of a levered firm are same so,
Value of firm A= Value of firm B
Number of equity shares* Price of equity shares of firm A = Number of equity shares* Price of equity shares of firm B
10*3= 5*price of shares of firm B
So, Price of shares of firm B= (30/5)= 6