The equation of trajectory of a projectile is $y=10x-\bigg(\large\frac{5}{9}\bigg)x^2$. If we assume $g=10\;ms^{-2}, the range of projectile (in metre) is :

Question

$$\begin {array} {1 1} (a)\;36 & \quad (b)\;24 \\ (c)\;18 & \quad (d)\;9 \end {array}$$