The total cost of a vacation was divided among 3 people. If the total cost of the vacation had been divided equally among 4 people, the cost per person would have been $60 less. What was the total cost cost of the vacation?  Choose the correct choice
A) $ 200	B) $ 300	C) $ 400	D) $ 720	E) $ 600

Rationale: "c for cost . p price per person . c = 3 * p c = 4 * p - 240 substituting the value of p from the first equation onto the second we get p = 240 . plugging in the value of p in the first equation , we get c = 720 . which leads us to answer choice d"
Answer: D