Question

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Q 2. A box 20 cm long, 10 cm wide and 7 cm
high is to be made which is open from top.
a) Find the area of cardboard required to make
the box.
b) Find the cost of the cardboard sheet at a rate
of Rs.3 per 10 cm?​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

L of box = 20 cm

B of box = 10 cm

H of box = 7 cm

a)

area of card board required = 2(L+B)H + L*B = 2(20+10)7 + 20*10 = 1600 cm²

b)

cardboard required = 1600 cm²

therefore, cost of cardboard = 160*3 = Rs 480

Step-by-step explanation:

the area of cardboard will be equal to the area of the box , and it's top will not be calculated because it is open from top.

rate of cardboard is 3 for 10 cm²

therefore area will be divided be 10 ,then area will become 160