Question

Find th
cost of painting a cuboid of dimensions 20cm*15cm*12cm at the rate of 5 paisa per sq cm?

Answer 1

Area of cuboid=l*b*d

20cm*15cm*12cm= 3600cm sq

Cost of painting 1 cm sq =5 paisa

Cost of painting 3600 cm sq =5*3600=18000 paisa

1₹=100 p

1p=1/100 ₹

18000p=18000/100=₹180

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Answer 2

To paint cuboid
Therefore we hve to find Total surface area of cuboid
TSA= 2(lb+bh+lh)
TSA=2(20*15+15*12+12*20)
TSA=2(300+180+240)
TSA=1440 sq cm
Now
Total cost = area*cost
=1440*5
=7200 paise
=₹72