Analyzing and Interpreting Income Tax Disclosures

The income tax footnote to the $2018$ financial statements for Boeing follows.

The components of income before tax were:

Income tax expense$/($benefit$)$ consisted of the following:

a$.$ What is the amount of income tax expense reported by Boeing each year?

b$.$ What percentage of total tax expense is currently payable for each year?

Round percentage to one decimal place $($example: $0\mathrm{.}7345=73\mathrm{.}5\%).$

c$.$ What is Boeing's effective $($average$)$ tax rate for each year?

Round percentage to one decimal place $($example: $0\mathrm{.}7345=73\mathrm{.}5\%).$

d$.$ Use the pretax information to determine the effective tax rate for U$.$S$.$ and Non$-$U$.$S$.$ operations for each year.

Round percentage to one decimal place $($example: $0\mathrm{.}7345=73\mathrm{.}5\%).$

e$.$ Determine the cash tax rate for U$.$S$.$ operations for each year. Hint: Current tax expense is paid in cash.

Round percentage to one decimal place $($example: $0\mathrm{.}7345=73\mathrm{.}5\%).$