Re: 老妈被据，签证公司是否骗子# Reunion - 探亲与陪读
f*y
1 楼
well they own their money this way:
profit = P*1500 - (1-P)* cost
where P is the possibility of getting visa;
to make this profit positive, we have:
cost < 1500*P/(1-P)
and basically, the cost they spend is just some routine documentation work,
as estimated a upper bound 100. Now we have:
100 < 1500*P/(1-P)
=> P>0.0625
So, as long as there is more than 6.25% possibility to get the visa, they
will do it.
And I believe almost every case will have more than 6.25% chance to get visa,
so they do it..
profit = P*1500 - (1-P)* cost
where P is the possibility of getting visa;
to make this profit positive, we have:
cost < 1500*P/(1-P)
and basically, the cost they spend is just some routine documentation work,
as estimated a upper bound 100. Now we have:
100 < 1500*P/(1-P)
=> P>0.0625
So, as long as there is more than 6.25% possibility to get the visa, they
will do it.
And I believe almost every case will have more than 6.25% chance to get visa,
so they do it..