Marc Batchelor, a self-employed sales consultant, has estimated annual earnings of $305,000 this year. His social security tax rate is 12.4% up to the wage base, Medicare is 2.9%, and his federal...

Marc Batchelor, a self-employed sales consultant, has estimated annual earnings of $305,000 this year. His social security tax rate is 12.4% up to the wage base, Medicare is 2.9%, and his federal income tax rate is 24%.

How much estimated tax (in $) must Marc send to the IRS each quarter?