Rhombus tiles

The floor of a building consists of 3000 rhombus-shaped tiles, and each of its diagonals is 45 cm and 30 cm in length. Find the cost of polishing the floor at the rate of $4 per square meter.

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You need to know the following knowledge to solve this word math problem:

planimetry

area of a shape
rhombus

Units of physical quantities

area
money

Grade of the word problem

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