Question

1. A plastic box 1.5 m long, 1.25 m wide and 65 cm deep is to be made. It is opened at the
top. Ignoring the thickness of the plastic sheet, determine:
(1) The area of the sheet required for making the box.
( The cost of sheet for it, if a sheet measuring Im' costs 20.​

Answer 1

Answer:

first write these (i)area of sheet required for making the box

5.45 m2.

(ii) cost of 5.25m2 sheet = 109

Step-by-step explanation:

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Answer 2

Given,

• L=1.5cm
• b=1.25cm
• (depth)h=65cm

Here we will convert 1.5cm & 1.25cm into m.

We know that,

$\boxed{ \bf\red{1m = 100cm}}$

• 1.5×100=150cm
• 1.25=125cm

$\boxed {\underline \pink{ \rm(i)T.S.A \: of \: a \: sheet = L.S.A + Area \: of \: base}}$

$\rm \qquad \underline \orange{= 2h(l + b) + l \times b}$

$\rm \qquad = 2 \times 65(150 + 125) + 150 \times 125$

$\rm \qquad = 130 \times 275 + 18750$

$\rm \qquad = 35750 + 18750$

$\rm \qquad = 54500 {m}^{2} (convert \: into \: cm) \longrightarrow \boxed { \rm= 5.45 {cm}^{2} }$

$\rm(ii)Cost \: of \: sheet \: at \: the \: rate \: of \: 20 \: per \: {m}^{2} = 5.45 {cm}^{2} \times Rs.20$

$\rm \qquad \qquad \qquad \qquad \boxed{ \green{= 109.00}}$

At above:-

• T.S.A:-Total surface area
• L.S.A:-Lateral surface area

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