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?
14
15
16
28
29
我写了完整的公式,竟然后半部分被吞了。。。算了,还是不留言了
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13+2x*0.3=14.44