For 2022 Randy unmarried taxpayer has wages of 45,000. He has a significant amount of income and intrest and therefore expects to have a federal income tax liability of 18,000. His total federal income tax withholding for the year is 9,500 Randy had $100,000 of adjusted gross income and a federal tax liability of 11,000 on his 2021 return. To avoid a penalty for underpayment of estimated taxses, what is the minimum amount of total edtimated tax that Randy must pay in 2022? Assume the payments are made on a timely basis.