Company QWERTY has a capital structure that currently consists of 60% common equity, 30% long-term debt and 10% preferred shares. This capital structure is believed to be optimal. The internal required return is 5%. New common stock can be issued at a cost of 7%. Beyond 300 euros of debt, the pre-tax cost of long-term debt raises from 11% to 12%. The company's marginal tax rate is 40%. Preferred shares can be issued to infinity at a cost of 15%. when calculating the WACC (weighted average cost of capital), the breakpoints are 750 euros and 1,000 euros. Calculate the amount of retained earnings.