please answer C with clear explaination

Mr. Mason's salary was $397,000, and Mrs. Mason's salary was $344,000. They had no other income items, no above-the-line or itemized deductions, and no dependents. Assume the taxable year is 2019. Use Individual Tax Rate Schedules and Standard Deduction Table a. Compute their tax on a joint return. b. Compute their combined tax If they file separate returns (married filing separately). c. Compute their marriage penalty (excess of tax on a joint return over combined tax on two returns filed as single taxpayers). Complete this question by entering your answers in the tabs below. Required A Required B Required C Compute their marriage penalty (excess of tax on a joint return over combined tax on two returns filed as single taxpayers). (Round your intermediate calculations and final answers to the nearest whole dollar amount.) Mr. Mason's tax if single Mrs. Mason's tax if single Combined tax if single $ 0 Combined tax from joint return Marriage penalty