Concept:Find the total apples thrown in both steps as a percentage of the original stock.Explanation:Assume the vendor had 100 apples.First day, he sells 60%, so apples left are:100−60=40 apples.He throws away 15% of this remainder:15% of 40=10015×40​=6 apples.Apples still left after this:40−6=34 apples.Next day, he sells 50% of these remaining 34 apples:50% of 34=10050×34​=17 apples.The rest are thrown away:34−17=17 apples.Total apples thrown:6+17=23 apples.Since total apples were 100, the percentage thrown is 23%.Answer:23%, which is option B.