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bill is replacing the grass in his yard with cement .the yard is 300m long and 100m wide. if cement is 15cents per cm how much would it cost?

He's replacing the grass with concrete, not cement.

300 m = 3,000 cm
100 m = 1,000 cm

3,000 * 1,000 = 3,000,000 square cm

3,000,000 * 0.15 = \$__________

3000000*0.15= \$450000

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