A square piece of tin of side 18 cm is used to make an open box by cutting a square of side 4 cm from each corner and folding up the flaps to form a box. What will be the volume of the box ?

$400\, cm^3$

Length of cuboid formed = 18 - 2×4 = 10

Breadth of cuboid formed = 18 - 2×4 = 10

Height of cuboid formed = 4

Volume of cuboid = l × b × h

= 10 × 10 × 4

= 400

The correct answer is option (2) : $400\, cm^3$