at the end of December $2008,$ into an account that pays interest at a rate of $4\mathrm{.}8\%$ compounded continuously. $t$

$($a$)$ Calculate the value of the account in December $2010.($Round your answer to three decimal places.$)$

$$9\mathrm{.}853$ billion

$($b$)$ How much would GM have had to invest at the end of December $2008,$ in one lump sum, into this account to build the same $2-$year future value as the one found in part $($a$)?($Round your answer to three decimal places.$)$

$$26\mathrm{.}572$ billion

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