The difference with preferred and common stock when it comes to dividends is that preferred stock will only get what they are entitled to - which is based on the shares, par value and %. Common shareholders could get anything - it has nothing to do with par value or number of shares. The preferred shareholders are paid first. Once you determine how much they have coming, anything left over goes to the common. We did deal with the common shareholders in that we determined that the preferred had $60,000 coming and therefore the remaining $20,000 went to the common shareholders. There was nothing else to calculate for the common - they get the balance after the preferred are satisfied.
I'm not sure exactly what you mean by the preferred always get $20,000 a year. In your example of 20,000 shares of 5%, $20 par value cumulative preferred stock, they get $20,000 per year. (5% x 20,000 x 20) If for example, you had 10,000 shares of 4%, $10 par value cumulative preferred stock, the calculation would be different: 4% x 10,000 x 10 = 4,000 In this case, if the preferred were in arrears for 2 years, they would be in arrears $8,000.
