A plastic box 1.5m long, 1.25m wide and 65cm deep is to be made. It is opened at the top. Find Area of the sheet required for making box. Also find the cost of sheet if a sheet measuring 1.5m² costs Rs 20.
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surface area of cuboid=2×(lb+bh+hl)
=2(150cm×125cm+125cm×65cm+65cm×150cm)
=2(18,750+8,125+9,750)
=2(36,625)
=73,250cm² sheet of plastic
-open top surface
=73,250-150cm×125cm
=73,250-18,750
=54,500cm²= 5.45m² sheet finally required
and price of 1.5m2 is ₹20
so 5.45 m² price =5,45/1.5=3.63×20₹
=72.66₹
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