Question

Cardboard costs $3.5 per cm2. How much will a jewellery box of dimensions 15 cm×10 cm×5 cm cost if it is made using this cardboard?

Answer 1

Given :

• Cost of cardboard =  $3.5 per cm²

To find :

• the cost if it is made using this cardboard

Steps :

• Here, we have to find the Total Surface Area of the cubical box.
• After, finding we have to multiply it by the cost of cardboard per cm.

Solution :

⇒ Let's find the Total Surface Area of the Box.

Total Surface Area = 2(lh + bh + lb)

                                = 2(15 × 5) + (10 × 5) + (15 × 10)

                                = 2(75) + (50) + (150)

                                = 2 × (75 + 50 + 150)

                                = 2 × 275

                                = 550

⇒ Now, let's multiply the total surface area by the rate.

Cost if made using cardboard = $3.5 × 550

                                                  = $1925

Therefore, the cost if it is made using this cardboard is $1925.