E$13-1($Algo$)$ Preparing and Interpreting a Schedule for Horizontal and Vertical Analyses $[$LO $13-2,$ LO $13-3,$ LO $13-5]$

The average price of a gallon of gas in $2021($$$3\mathrm{.}01)$ was up $$0\mathrm{.}84(38\mathrm{.}7$ percent$)$ from $$2\mathrm{.}17$ in $2020.$

Required:

$1.$ Conduct a horizontal analysis by calculating the year$-$over$-$year changes in each line item, expressed in dollars and in percentages for the income statement of Tiger Industries for the year ended December $31,2021($amounts in billions$).$

$2-$a$.$ Conduct a vertical analysis by expressing each line as a percentage of total revenues.

$2-$b$.$ Did Tiger earn more gross profit per dollar of revenue in $2021$ compared to $2020?$