“The Horse Trading Riddle: Can You Calculate the Profit?”

Let’s break down the transactions step by step to determine how much money the man made or lost:

1. **First Transaction:**
– Buys the horse for $60.
– Sells the horse for $70.
– **Profit from this transaction:** $70 – $60 = **$10**.

2. **Second Transaction:**
– Buys the horse back for $80.
– Sells the horse again for $90.
– **Profit from this transaction:** $90 – $80 = **$10**.

3. **Total Profit:**
– Adds up the profits from both transactions: $10 (first transaction) + $10 (second transaction) = **$20**.

So, the man made a total profit of **$20**.