2. Robert Redrick, without obtaining an extension, filed his calendar year 2021 federal tax return on July 20, 2022. His delinquency was not due to reasonable cause. The tax shown on the return was $8,000. Of this amount $3,000 had been paid by withholding from wages, and $4,000 paid as estimated tax. On August 21, 2022, Robert paid the $1,000 balance due. What amount of penalty must Robert pay for filing to pay his tax by the return due date?