A t-shirt is on sale for $20. Today, a morning sales clerk decreases the price by 30%, and then the afternoon sales clerk increases the price by 20%. What is the final price of the t-shirt?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.