Chuck, a single taxpayer, earns $$76,400$ in taxable income and $$11,500$ in interest from an investment in City of Heflin bonds. $($Use the U$.$S$.$ tax rate schedule.$)$

Required:

a$.$ If Chuck earns an additional $$40,000$ of taxable income, what is his marginal tax rate on this income?

b$.$ What is his marginal rate if$,$ instead, he had $$40,000$ of additional deductions?

Note: For all requirements, do not round intermediate calculations. Round percentage answers to $2$ decimal places.

$\backslash$table$[[\backslash$table$[[$Individuals$],[$Schedule X$-$Single$]],,],[$If taxable income is over,But not over:,The tax is:$],[S,$S $11,000,10\%$ of taxable income$],[$$$11,000,$$$44,725,$$$1,100$ plus $12\%$ of the excess over $$11,000$