$\frac{d^{2}y}{d{x}^2}=6x-0\mathrm{.}5x^2,y(0)=0,y(12)=0$

If one was using shooting method with Euler's method with a step size of $h=4,$ and an assumed value of $\frac{dy}{dx}(0)=20,$ then the estimated value of $y(12)$ in the first iteration most nearly is

$($A$)60\mathrm{.}0$

$($B$)496\mathrm{.}0$

$($C$)1088$

$($D$)1102$