Question

A box 20 cm long, 10 ,cm wide and 0.7 cm is to be made which is open from the top. Find the a)area of cardboard required to make the box.b)cost of cardboard@rs 2per 5sqcm

Answer 1

ANSWER :-

a) 200 cm²

b) Rs. 80

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Answer 2

Answer:

a) 242cm²

b) ₹ 121

Step-by-step explanation:

length = 20cm, wide = 10cm and height = 0.7cm

Now,

a)area of cardboard required to make the box

= 2(lb+bh+hl) - lb

because, The upper part is open.

so,

= 2(20x10+10x0.7+0.7x20) - 20x10

= 2(200+7+14) - 200

= 400+14+28-200

= 242cm²

b) cost of cardboard ₹2/cm²

= 242cm²x₹2/cm² = ₹ 121