4. Bartleby Corporation is undergoing liquidation under Chapter 7 of the bankruptcy code. Bartleby reports total liabilities of $820,000. Its assets have a liquidation value of $650,000. Of those assets, $300,000 is pledged as security on debt obligations of $220,000, and another $120,000 is pledged as security on $180,000 of liabilities. Unsecured liabilities with priority are $30,000.

Calculate the net proceeds available to unsecured creditors without priority, and the dividend rate that they will receive under the liquidation.