Question

4. A piece of cardboard is 4.5 m long and 3.5 m wide. What is the cost of painting it on both the
sides at the rate of 1.25 per square metre?​

Answer 1

Answer :

$\sf\large\underline\blue{=>\:Rs\:39.38}$

Given :

• Length = 4.5 m
• Width / Breadth = 3.5 m
• Rate = Rs. 1.25

Formula should be used :

• Area = Length ( L ) × Breadth / width ( B )

According to the question :

Cost = 2 × Area × Rate

=> 2 × ( L × B ) × Rate

=> 2 × ( 4.5 × 3.5 ) × 1.25

=> 4.5 × 3.5 × 2.50

=> Rs. 39.375

=> $\sf\large\underline\blue{Rs.\:39.38}$

‏‏‎ ‎

Answer 2

cost = 2* rate* area

= 2lb* rate

= 2* 4•5* 3•5* 1•25 Rs.

= 4•5* 3•5* 2•5 Rs.

= 39•375 Ans

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