SOLUTION
The composite shape consists of a cube and a cuboid.
Once face of the cube has been fused with the cuboid, so we will consider only 5 faces of the cube. And also subtract the area of one face of the cube from the cuboid
So total surface area of the composite shape becomes
[tex]\begin{gathered} 5l^2+2(lw+lh+wh)-area\text{ of one face of cube} \\ 5\times4^2+2(15\times10+15\times7+10\times7)-4^2 \\ 80+2(150+105+70)-16 \\ 80+2(325)-16 \\ 80+650-16 \\ 714in^2 \end{gathered}[/tex]
Hence the first option is the answer
