**Riddle**: A man bought a horse for $50 and sold it for $60. He then bought the horse back for $70 and sold it again for $80. What’s the financial outcome of these transactions?

**Answer**: What seems like he’s firing people is that the man is selling the horse for $ 60 and then buying that horseback for $ 70, it looks like he’s spending another $ 10.

But the correct way to solve the problem is to consider the two operations separately: -50 + 60 = 10 and -70 + 80 = 10.

Since the guy earns $ 10 each sale, he makes $ 20 in total.