Fill in the remaining information and compute the estimated value of b$.$

Year

$($t$)$ Marketing

$($X$)$ Sales

$($Y$)$ X$\_$t$-$X $$ Y$\_$t$-$Y $($X$\_$t$-$X $)($X$\_$t$-$X $)($X$\_$t$-$X $)^2$

$11035$

$21545$

$31240$

$42050$