.Mambo Corporations December 31, 2020 balance sheet showed the following Shareholder Equity:

Paid in Capital:
8% preferred stock, $20 par value, cumulative	$ 150,000
Common stock, $10 par value	500,000
Additional Paid-in capital in excess of parP/S	200,000
Additional Paid-in capital in excess of parC/S	900,000
Total Paid In Capital	1,750,000
Retained Earnings	2,000,000
Total PIC and Retained Earnings	3,750,000
Less: Treasury Stock (3,000 shares, Common)	(50,000)
Total Shareholders' Equity	$ 3,700,000

How many shares of common stock are outstanding