Question 586026
Hint: if C is the cost of the yacht and x is the cost per person (for 7 people), then


C/7 = x


represents the idea that the cost divided amongst 7 people is x



Now divide that same cost by 8 people to get the cost per person to drop by $2000 which gives us


C/8 = x-2000



From here, you can plug in x = C/7 to get 



C/8 = C/7 - 2000



Now solve for C. I'll let you do that.