Data from Target's $2014$ annual report$$ indicate that the equation of change for the revenue R$,$ in millions of dollars, from $2010$ through $2014$ is

dRdt

$=1647\mathrm{.}7,$

where t is the time, in years, since $2010.$ If the initial revenue is $66,827\mathrm{.}4$ million dollars, find an equation that gives R as a linear function of t$.$

R$($t$)=$