Question

Gopal sweets placed an order of making 30 cm x 20 cm x 6 cm cardboard boxes for packing their sweets . For all overlaps 4% of total area is required extra. If cost of the cardboard is 25 p for 100 cm square. Find the cost of the cardboard used for making 1000 boxes

Plz i need full explanation

Answer 1

Cardboard Required to make 1 box Surface Area = 2 × (30 × 20) + 2 × (30 × 6) + (4% of total surface area)

$\sf = 1200 + 240 + 360 + \frac{4}{100} × (1200 + 240 + 360)$

$\sf = 1800 + 72 = 1872cm^2$

Total cardboard = 1872 × 1000 = 1872000cm²

Now, for 100cm² = 25 paisa = 1/4 rupee

So, total money = $\sf 1872000 × \frac{1}{4} \times \frac{1}{100} = 4680$ rupees