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31 January, 02:59

Jim pays $75 per month for a call phone plane plus $0.30 per minute beyond the first 1000 minutes. His bill was $105.60 last month. How many minutes did he use

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  1. 31 January, 03:07
    0
    Answer: 1102 minutes

    Explanation: Let x be the number of minutes Jim used 105.60 = 75 + 0.30 (x - 1000) ⇒ 105.60 = 75 + 0.30 x - 300 ⇒ 105.60 = 0.30 x - 225
  2. 31 January, 03:17
    0
    75 + 0.30x = 105.60

    0.3x = 30.6

    x = 102

    1000 + 102 = 1102

    Jim used 1102 minutes.
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