The authorized common stock of SP Plumbing and Heating company is 150,000. The company's financial statement, the shareholders equity is accounted for as follows:

Common stock ($2 par value)	$ 80,000
Additional paid-in capital	13,000
Retained earnings	43,000
Common equity	$ 136,000
Treasury stock (4,000 shares)	6,000
Net common equity	$ 130,000

a) How many shares are issued?

b) How many shares are outstanding?

c) How many more shares can be issued without the approval of shareholders?