Find the area of the card board that is required to make a box of size 10 cm × 8 cm × 4 cm.

Correct option is C

Solution:
Dimension of box = 10 cm x 8 cm x 4 cm
Total surface area of box = 2 (lb + bh + hl)
:. Total surface area of box = 2 (10 × 8 + 8 × 4 + 4 × 10) = 2 × (80 +32 + 40)
= 2 x 152 = 304 cm2