The floor of Li Hua's bedroom is 6m long and 3M wide. He chose the following two kinds of floor tiles: 30cm * 30cm, each 6.5 yuan, 40cm * 40cm, each 9 yuan (1) How many square tiles are needed to cover the whole floor with 30cm square tiles? (2) How many square tiles are needed to cover the whole floor with 40cm square tiles? (3) What kind of floor tile is cost-effective for this bedroom?

The floor of Li Hua's bedroom is 6m long and 3M wide. He chose the following two kinds of floor tiles: 30cm * 30cm, each 6.5 yuan, 40cm * 40cm, each 9 yuan (1) How many square tiles are needed to cover the whole floor with 30cm square tiles? (2) How many square tiles are needed to cover the whole floor with 40cm square tiles? (3) What kind of floor tile is cost-effective for this bedroom?

30 cm = 0.3 M
6 times 3 divided by (0.3 times 0.3)
=18 divided by 0.09
=200 yuan
40 cm = 0.4 m
6 times 3 division (0.4 times 0.4)
=18 divided by 0.16
=112.5 = 113 pieces
200 times 6.5 = 1300 yuan
113 times 9 = 1017 yuan
The second method is used when 1300 yuan is less than 1017 yuan
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