Two models $R_1$ and $R_2$ are given for revenue $($in millions of dollars$)$ for a corporation. Both models are estimates of revenues from $2030$ through $2035,$ with $t=0$ corresponding to $2030.$

$R_1=7\mathrm{.}23+0\mathrm{.}26t+0\mathrm{.}03t^2$

$R_2=7\mathrm{.}23+0\mathrm{.}1t+0\mathrm{.}01t^2$

Which model projects the greater revenue?

$n_1$ projects the greater revenue.

$R_2$ projects the greater revenue.

How much more total rasenue $($in millions of dollars$)$ does that model project over the six$-$year period ending at $t=5?($Round your answer to three decimal places.$)$

$ $$ million