Q23:
The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month. If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?
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A. 14
B. 15
C. 16
D. 28
E. 29
选B 可偶算出来是14 哪位讲讲算法啊,谢谢拉 | 
