Two travel agencies, A and B, have launched a new travel project to a certain place. The price is 400 yuan per person. Since the ‘National Day’ Golden Week has just passed, the two travel agencies hav

Two travel agencies, A and B, have launched a new travel project to a certain place. The price is 400 yuan per person. Since the ‘National Day’ Golden Week has just passed, the two travel agencies have

1), YA=(400*0.75)*X

YB=(400*0.8)*(X-1)

2) Substitute 10 into the above formula, Y A = 3000 yuan, Y B = 2880 yuan, B is more favorable

3) That is, analysis (400*0.75)*X < (400*0.8)*(X-1 ), when the conditions of