a rectangular piece of plastic sheet measures 1 metre by 40 cm find its cost at the rate of Rs 80 per square metre
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area of rectangular sheet =l×b
=1m×40cm=100cm×40cm=4000cm sq.=4m sq. as 1m sq.=10000cm sq.
so cost of 1m sq.=rs 80
so 4 m sq.=80×4=320 Rs
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