How to evaluate a managed property?

[Babu Ramadoss]

Hi

    I am currently working with a real estate investment firm who buy properties, fix them and sell them and manage them for their buyers. I see that from they mark up around 25% over the sale price + cost to fix the property. For example, if they purchase a property for 90K and spend around 40K on fixing things and then mark it to sell for 165K. I thought that was a huge margin but their listings are selling quickly. Is that a common % of mark ups for such properties that are flipped for sale by these investment firms? I feel like I am paying more price than the real estate value in that area. Is it still a wise passive investment? I am more interested in hearing from investors than agents on this topic.