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**Hint:**A cuboid is a three-dimensional structure having six rectangular faces. These six faces of the cuboid exist as a pair of three parallel faces. When the area of the faces of a cuboid is the same, we call this cuboid a cube. The area of all the faces of a cube is the same as they are all squares.

Volume of cuboid: The total surface area of a cuboid is equal to the sum of the areas of the six rectangular faces whereas the Lateral surface area of a cuboid equal to the sum of the four rectangular faces, in which two rectangular faces of the top and bottom faces are excluded.

Since cost is in \[30m\]. Therefore, Volume of cuboidal pit dug is directly proportional to cost.

Volume of Cuboid \[ = length \times breadth \times height\]

**Complete step-by-step answer:**

Length of Cuboid \[ = 8m\]

Breadth of Cuboid \[ = 6m\]

Height of Cuboid \[ = 3m\]

According to the Volume of Cuboid Pi \[ + \]

\[ = length \times breadth \times height\]

\[ = 8 \times 6 \times 3\]

\[ = 144\]${m^3}$

Cost of digging cuboidal pit for $1{m^3}$$ = \,Rs.30$

Cost of digging cuboidal pit $144{m^3}$$ = Rs.(144 \times 30)$

$ = Rs.4320$

$\therefore $ Total Cost of digging the pit $ = Rs.4320$

**Note:**Since the cost is in ${m^3}$. So, there will be no alternative. But if there was a cost in ${m^2}$ then the formulae of Total Surface Area will be Applied as.

$T.S.A = 2(length \times breadth + breadth \times height + height \times length)$

And then T.S.A is multiplied with the cost to yet the total cost of digging the cuboidal pit.

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