Question

find the cost of painting a rectangular cardboard at the rate of 10 Paisa per square cm the length and breadth of the cardboard are 90 cm and 3/4m respectively ​

Answer 1

Breadth= 3/4m=75cm

Length=90cm

area=l*b

=75*90

cost of painting=(75*90)/10

=675paisa

=Rs6.75(ans)

Answer 2

The cost of painting rectangular cardboard is Rs 675.

Step-by-step explanation:

We are given that the cost of painting rectangular cardboard at a rate of 10 Paisa per square cm.

Also, the length and breadth of the cardboard are 90 cm and (3/4) m respectively.

Let the length of the cardboard = L = 90 cm

and the breadth of the cardboard = B = $\frac{3}{4} \text{ m}$ = $(\frac{3}{4}\times 100) \text{ cm}$

                                                               = (3 $\times$ 25) = 75 cm

Now, the area of the rectangular cardboard = Length $\times$ Breadth

            Area  =  L $\times$ B

                      =  90 cm $\times$ 75 cm = 6750 $\text{cm}^{2}$

Cost of painting 1 $\text{cm}^{2}$ of rectangular cardboard = 10 paise

Cost of painting 6750 $\text{cm}^{2}$ of rectangular cardboard = (6750 $\times$ 10) paise

                                                                               = 67500 paise

Converting paise to rupees we get;

         1 paise = $\text{Rs }\frac{1}{100}$  

         6750 paise = Rs $\frac{67500}{100}$  = Rs 675.

Hence, the cost of painting a rectangular cardboard is Rs 675.