> 
> I sold a watch to Joanne at $\$20$ profit. After a couple of days,
>  Joanne sold the same watch back to me at $\$20$ profit. Was it an even
>  deal for me?
> 
> 
> 

If not, how could I compute the loss or gain incurred (by me) in this whole deal?

---

**Question before:**

TITLE: **Computing the total loss incurred in selling a an item (at profit) and then buying it back (at loss)**

> 
> I bought a book for $\$60$.Then I sold it off to a friend for
>  $\$70$.But after a while I felt sorry that I sold it and bought it
>  back for $\$80$.How much loss did I incur?
> 
> 
> 

This is similar to I sell the object to a person at $\$10$ profit and then the person sold it back to me at $\$10$ profit,I understand that I am incurring loss in the deal but how to compute the percentage loss or the loss itself?

**Reason for the change:**

There were some comments indicating that the question/title is not be properly stated and will probably reduce people's tendency to want to deal with it, hence I attempted to make it more compact and to the point but unfortunately, in the process of editing I might have changed the question to a degree that is not intended in general. My apologies to all for this inconvenience.

To maintain the consistency of @Srivatsan's answer I am keeping the both version.

Thanks,