In $2020,$ Natural Selection, a nationwide computer dating service, had $$530$ million of assets and $$215$ million of liabilities. Earnings before interest and taxes were $$135$ million, interest expense was $$28\mathrm{.}9$ million, the tax rate was $40$ percent, principal repayment requirements were $$25\mathrm{.}5$ million, and annual dividends were $40$ cents per share on $21\mathrm{.}9$ million shares outstanding.

a$.$ Calculate the following for Natural Selection:

Note: Round your answers to $2$ decimal places.

$\backslash$table$[[$Liabilities$-$to$-$equity ratio,$0\mathrm{.}68],[$Times$-$interest$-$earned ratio,$4\mathrm{.}67],[$Times burden covered,$1\mathrm{.}89]]$

b$.$ What percentage decline in earnings before interest and taxes could Natural Selection have sustained before failing to cover: Note: Round your answers to $1$ decimal place.

$\backslash$table$[[$Interest payment requirements?,$78\mathrm{.}6,\%$