At the beginning of the period, a company reported $100,000 of common stock, $10 par; and $50,000 paid-in capital in excess of par. At the end of the period, this company reported $110,000 of common stock, $10 par; and $90,000 paid-in capital in excess of par. Cash received from the sale of common stock during the year is $__________.

The Answer is $50000

How is the answer 50000? Thank you!