In order to attract more customers, travel agencies A and B respectively launched group discounts for traveling to a certain place. Travel agency A’s discount method is: buy 4 tickets

(1) According to the meaning of the question, when x≤4, y1=100x,

When x>4, y1=100×4+100×12×(x-4) =50x+200;

So, y1=100x(0≤x≤4)50x+200(x>4),

y2=34×100x=75x;

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(2) When y18,

When y1=y2, 50x+200=75x, the solution is x=8,< /p>

When y1>y2, 50x+200>75x, the solution is x<8,

So, when the group size is greater than 8, it is more favorable to choose travel agency A. When the group size is less than 8, Choosing travel agency B has a better discount. When the group size is equal to 8, the two travel agencies have the same discount.