请教一道ps题，没思路

a10285

MS Adam sold two properties, X and Y, for $30,000 each. She sold properties X for 20 percent more than she paid for it and sold Y for 20 percent less than she paid for it. If expences are disregarded. What was her total gain or loss, on the two properties?
correct answer: loss of $2,500   找不到思路解题，，，请大家帮帮忙~~~谢谢了

keaneice

最直接方法，设x原价a，列方程求出原价。然后用卖家-原价 得到获利

设y原价b，列方程求出原价b，然后原价-卖价 看亏了多少，  

然后就知道总收益了

lovesasa0820

(30000/1.2)*0.2-(3000/0.8)*0.2

a10285

非常感谢，原来我是看错题了，看成进价是30000了，的确是(30000/1.2)*0.2-(30000/0.8)*0.2
谢谢二位