Marginal Tax Rate. Jill and George are married and file a joint return. They expect to have \($490,000\) of taxable income in the next year and are considering whether to purchase a personal residence that would provide additional tax deductions of \($40,000\) for mortgage interest and real estate taxes.

a. What is their marginal tax rate for purposes of making this decision?

b. What is the tax savings if the residence is acquired?