Question

A rectangular piece of a plastic sheet measure 1 m by 70 cm ,find it cost @ of rupees 80 per square metre?

Answer 1

Here,
Let length=1m
and breadth=70cm or
=70/100m =7/10m
Area of plastic sheet=1×7/10m
=7/10m2
Cost of plastic sheet=7/10×80
=Rs. 56