The table given below shows how, on average, the market value of a Boeing $737$ has

varied with its age and the cash flow needed in each year to provide a $10\%$ return.

$($For example, if you bought a $737$ for $$19\mathrm{.}87$ million at the start of year $1$ and sold it

a year later, your total profit would be $18\mathrm{.}08+3\mathrm{.}78-19\mathrm{.}87=$$$1\mathrm{.}99$ million, $10\%$ of

the purchase cost.$)$

Assume airlines write off their aircraft straight$-$line over $15$ years to a salvage value

equal to $20\%$ of the original cost.

a$.$ Calculate economic depreciation, book depreciation, economic return, and book

return for each year of the plane's life. $($Leave no cells blank $-$ be certain to enter $"0"$

wherever required. Do not round intermediate calculations. Enter your answers in

millions except for percentage values. Round your percentage answers to $1$

decimal place and other answers to $2$ decimal places.$)$

b$-1.$ Suppose an airline invested in a fixed number of Boeing $737$s each year.

Calculate the steady$-$state book rate of return. $($Do not round intermediate

calculations. Enter your answer as a percent rounded to $2$ decimal places.$)$