A company projects that next year's sales will grow 17% and ROA (net income divided by the previous year's total assets) is constant at 11%, but long-term debt and equity do not change with sales automatically (except for the new retained earnings). The current year's total assets and accounts payable are $5000 and $900. Accounts payable usually grow at the same rate as sales. The company's plowback ratio is always 70%. Assuming that total assets must grow at the same speed as sales, what is next year's external financing need?