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Option 5 : Rs. 1814400

First we need to calculate the area of rhombus

Area of rhombus = 1/2 × d1 × d2 = 1/2 × 36 × 24 = 432 m2

There are 1200 times which are required for decoration purpose

Area of 1200 tiles = 1200 × 432

⇒ Area of 1200 times = 518400 m2

∴ Total expense by owner = 518400 × 3.5 = Rs. 1814400
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