Valdez dies in 2015, leaving a taxable estate of $6,400,000. In 2007, he made a taxable gift of $300,000 upon which he paid no tax due to the availability of the unified tax credit. Compute Valdez’s estate tax. Click to access Exhibit 18-1, Unified Tax Credit and Unified Transfer Tax Rates to use for this problem. Valdez’s estate tax is?