Dad chose a mobile phone service that includes 30 megabytes of traffic per month for 5 yuan. Dad used up 95% of the traffic this month, how many megabytes did he use?
爸爸选用了一种5元包一个月30兆流量的手机业务．本月爸爸用去了流量的95%，用去了多少兆流量？
<result>285</result>