Answer:
40,000 shares
Step-by-step explanation:
Data provided as per the question below:-
 Issued shares = 50,000 
Treasury stock purchased = 10,000 
The computation of the number of outstanding shares of common stock is shown below:-
Outstanding shares = Issued shares - Treasury stock purchased 
 = 50,000 - 10,000 
= 40,000
Therefore for computing the outstanding shares we simply applied the above formula.