Chuck, a single taxpayer, earns $$77,000$ in taxable income and $$11,100$ in interest from an investment in City of Heflin bonds. $($Use the U$.$S tax rate schedule.$)$

Required:

a$.$ How much federal tax will he owe?

b$.$ What is his average tax rate?

c$.$ What is his effective tax rate?

d$.$ What is his current marginal tax rate?