Imaging Inc., a developer of radiology equipment, has stock outstanding as follows: 21,000 shares of cumulative preferred 1% stock, $130 par, and 70,000 shares of $10 par common. During its first four years of operations, the following amounts were distributed as dividends: first year, $18,270; second year, $46,330; third year, $70,420; fourth year, $116,900.