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 difhvo;n mf7 16 xjtndv,)ferent pricingg 5ag7+) exz7c:tcc1drhkf z 5 structures. TechMind charges 115 dollars, plus an upfront fee of 250 dollars for booking an appointment. RiddleBreak doesn't charge for booking an appoint7g)ea1 t x cz:kfg5+75czhrcdment, 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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