As shown in the above figure, from 2008 to 20 1 1, the number of tourists in Guilin elephant trunk mountain is tens of thousands every year.

Compared with the previous year, the number of tourists in tourist spots B in 20 10 (1) increased the fastest. (2) From 2007 to 20 1 1 year, both tourist spots A and B received an average of 30,000 tourists per year, but the fluctuation range of tourists in tourist spot A was greater than that in tourist spot B. (3) From the meaning of the question, we can get that x≥ 100 and X-80 ≥/kloc-. Therefore, the ticket price of tourist attraction A should at least be increased in 20 yuan.