1.

The floor of a building consists of 2000 titles which are rhombus shaped and each of its diagonals are 40 cm and 25 cm. Find the total cost of polishing the floor, if the cost per m2 = Rs 5.

Answer»

Area of each title = \(\frac{1}{2}\) x d1 x d2 sq. units 

= \(\frac{1}{2}\) x 40 x 25 cm = 500 cm 

∴ Area of 2000 titles = 500 x 20,000 = 10,000 cm 

= 100 m2

Cost of polishing 1 m2 = Rs 5

∴ Cost of polishing 100 m2 = 5 x 100 = Rs 500


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