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a) Cost = 39 x 1.62 = $63.18

b) Cost of first 40 m3 of water = 1.62 x 40 = $64.80
113.20 – 64.80 = $48.40
48.40/2.2 = 22
40 + 22 = 62
The Lim family used 62 m3 of water.

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