A man purchases 8 pens for $9 and sells 9 pens for $8. How much profit or loss percent does he make?  Ops:   A. 20.12%, Profit    B. 15.28%, Loss    C. 20.98%, Loss    D. 15.42%, Profit

To solve this problem, we first need to find the cost price and the selling price per pen.

1. The cost price per pen is $9/8 =$1.125.
2. The selling price per pen is $8/9 =$0.8889 (approximately).

Next, we calculate the loss, which is the difference between the cost price and the selling price.

3. Loss per pen = Cost price - Selling price = $1.125 -$0.8889 = $0.2361 (approximately).

Now, we calculate the loss percentage, which is the loss per pen divided by the cost price per pen, multiplied by 100%.

4. Loss percentage = (Loss per pen / Cost price per pen) * 100% = ($0.2361 /$1.125) * 100% = 21% (approximately).

So, the man makes a loss of approximately 21%. The closest answer to this is option C. 20.98%, Loss.