本题目来源于试卷: IB MAI HL Functions Topic 2.2 Applications of Functions，类别为 IB数学
[问答题]
Two IT consulting firms have di ) 8ehjm*qpq;vzyez a p7t60/bfferent pricing structures9luccrra/88 z1u 56yq5 bhx fl. TechMind charges 115 dollars, plus anrbf uy8 /85cxhr 5l6cq9z1lau upfront fee of 250 dollars for booking an appointment. RiddleBreak doesn't charge for booking an appointment, but the rate is 60 dollars per hour. Let $C_1$(t) and $C_2$(t) be the costs, in dollars, of consulting t hours by TechMind and RiddleBreak respectively.
1.Write down expressions for the costs of consulting, $C_1$ and $C_2$, in terms of the number of hours, t, charged.
2.Find the least number of whole hours of consulting from TechMind for its servicesservices to be a cheaper option.
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