It takes 1000 pieces to use 12 cm long square bricks to pave the floor of a room. If you use 18 cm long square bricks to pave the floor, how many pieces do you need? (keep the number in integer)

12 × 12 × 1000 △ 18 × 18 ≈ 444 (pieces)
A: it costs 144 yuan

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