Question

How much ribbon will be needed to put around a square display board of side 80 cm? What will be the cost of the ribbon required, if the ribbon costs 11 per m?​

Answer 1

Given :

• The display of the square board is 80 cm. The cost of ribbon is Rs.11 per m.

$\rule{200pt}{3pt}$

To Find :

• Cost of ribbon needed to put around the display board .

$\rule{200pt}{3pt}$

Solution :

✏ Formula Used :

$\large{\color{cyan}{\bigstar}} \: \: {\underline{\boxed{\pink{\sf{ Perimeter{\small_{(Square)}} = 4 \times Side }}}}}$

$\qquad{\rule{150pt}{1pt}}$

✏ Calculating the Perimeter :

${\longmapsto{\qquad{\sf{ Perimeter{\small_{(Display \: Board)}} = 4 \times Side }}}} \\ \\ \ {\longmapsto{\qquad{\sf{ Perimeter{\small_{(Display \: Board)}} = 4 \times 80 }}}} \\ \\ \ {\qquad{\textsf{ Perimeter of the Display board = {\red{\sf{ 320 \: cm }}}}}}$

$\qquad{\rule{150pt}{1pt}}$

✏ Calculating the Cost :

${\dashrightarrow{\qquad{\sf{ Cost = Perimeter \times Rate }}}} \\ \\ \ {\dashrightarrow{\qquad{\sf{ Cost = \dfrac{320}{100} \times 11 }}}} \: \: \: \: {\qquad {\pink{\bigg\lmoustache{\underline{\green{\sf{ 100 \: cm = 1 \: m }}}} \bigg\rmoustache}}} \\ \\ \ {\dashrightarrow{\qquad{\sf{ Cost = \cancel\dfrac{320}{100} \times 11 }}}} \\ \\ \ {\dashrightarrow{\qquad{\sf{ Cost = 3.20 \times 11 }}}} \\ \\ \ {\qquad{\sf{ Cost \: of \: Ribbon \: = {\blue{\sf{ ₹ \: 35.2 }}}}}}$

$\qquad{\rule{150pt}{1pt}}$

✏ Therefore :

❝ Cost of applying the ribbon around the Display board is ₹ 35.2 . ❞

$\\ {\underline{\rule{300pt}{9pt}}}$

Answer 2

Answer:

Refer to the attachment for your answer.